diff --git a/TASMAN-core/src/main/java/it/inaf/ia2/tsm/TapSchema.java b/TASMAN-core/src/main/java/it/inaf/ia2/tsm/TapSchema.java
index 821cd9006e926ffbea470d355fe20a439086ec46..ebdcc661962277fcb727b11003a8cb6247dd95d7 100644
--- a/TASMAN-core/src/main/java/it/inaf/ia2/tsm/TapSchema.java
+++ b/TASMAN-core/src/main/java/it/inaf/ia2/tsm/TapSchema.java
@@ -684,12 +684,12 @@ public class TapSchema implements EntitiesContainer<Schema>, Serializable {
     private void fillColumnDescriptionsAndStd(SchemaModel schemaModel, String schemaName) {
         Schema schema = getChild(schemaName);
         schema.setValue(DESCRIPTION_KEY, schemaModel.getDescription());
-        for (TableModel tableModel : getTapSchemaModel().getTables().values()) {
+        for (TableModel tableModel : schemaModel.getTables().values()) {
             Table table = schema.getChild(tableModel.getName());
-            schema.setValue(DESCRIPTION_KEY, tableModel.getDescription());
+            table.setValue(DESCRIPTION_KEY, tableModel.getDescription());
             for (PropertyModel propertyModel : tableModel.getProperties().values()) {
                 Column column = table.getChild(propertyModel.getName());
-                schema.setValue(DESCRIPTION_KEY, propertyModel.getDescription());
+                column.setValue(DESCRIPTION_KEY, propertyModel.getDescription());
                 if (propertyModel.isStandard()) {
                     column.setValue(STD_KEY, 1);
                 }
diff --git a/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/PropertyModel.java b/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/PropertyModel.java
index 95228f1c574d51d7dab9670f0da022479a720937..557b1420a4db204530e87c8fa6c2de69978f9a88 100644
--- a/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/PropertyModel.java
+++ b/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/PropertyModel.java
@@ -22,6 +22,7 @@
  */
 package it.inaf.ia2.tsm.model;
 
+import java.io.Serializable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlTransient;
 
@@ -29,7 +30,9 @@ import javax.xml.bind.annotation.XmlTransient;
  *
  * @author Sonia Zorba {@literal <zorba at oats.inaf.it>}
  */
-public class PropertyModel {
+public class PropertyModel implements Serializable {
+
+    private static final long serialVersionUID = -982004697900839996L;
 
     private String name;
     private String type;
diff --git a/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/SchemaModels.java b/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/SchemaModels.java
index 192c5136f036b79a4a5b4beb4d11e6ed608d57be..b4c5205b5f100f28f644e020713013298467612f 100644
--- a/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/SchemaModels.java
+++ b/TASMAN-core/src/main/java/it/inaf/ia2/tsm/model/SchemaModels.java
@@ -148,14 +148,22 @@ public class SchemaModels {
         return getTapSchemaModel(version).getTables().get(tableName);
     }
 
-    public static List<String> getAvailableTapSchemaVersions() {
+    private static List<String> getAvailableVersions(Map<String, SchemaModel> schemaModels) {
         List<String> versions = new ArrayList<>();
-        for (SchemaModel tapSchemaModel : TAP_SCHEMA_MODELS.values()) {
+        for (SchemaModel tapSchemaModel : schemaModels.values()) {
             versions.add(tapSchemaModel.getVersion());
         }
         return versions;
     }
 
+    public static List<String> getAvailableTapSchemaVersions() {
+        return getAvailableVersions(TAP_SCHEMA_MODELS);
+    }
+
+    public static List<String> getAvailableIvoaSchemaVersions() {
+        return getAvailableVersions(IVOA_SCHEMA_MODELS);
+    }
+
     public static SchemaModel getIvoaSchemaModel(String version) {
         return IVOA_SCHEMA_MODELS.get(version);
     }
diff --git a/TASMAN-core/src/main/resources/schema_definition/ivoa-1_1.xml b/TASMAN-core/src/main/resources/schema_definition/ivoa-1_1.xml
index 9a5c96dcd4e8907d4ccff60894e38d78b47fcc8f..5d71c1c463f4a725e3d08d587718a40a0341360c 100644
--- a/TASMAN-core/src/main/resources/schema_definition/ivoa-1_1.xml
+++ b/TASMAN-core/src/main/resources/schema_definition/ivoa-1_1.xml
@@ -30,6 +30,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>Logical data product type (image etc.)</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>calib_level</name>
@@ -37,6 +38,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <updatable>true</updatable>
                 <nullable>false</nullable>
                 <description>Calibration level {0, 1, 2, 3, 4}</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>obs_collection</name>
@@ -45,6 +47,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <updatable>true</updatable>
                 <nullable>false</nullable>
                 <description>Name of the data collection</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>obs_id</name>
@@ -53,6 +56,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <updatable>true</updatable>
                 <nullable>false</nullable>
                 <description>Observation ID</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>obs_publisher_did</name>
@@ -61,13 +65,15 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <updatable>true</updatable>
                 <nullable>false</nullable>
                 <description>Dataset identifier given by the publisher</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>access_url</name>
-                <type>VARCHAR</type>
+                <type>CLOB</type>
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>URL used to access (download) dataset</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>access_format</name>
@@ -75,12 +81,14 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>File content format</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>access_estsize</name>
                 <type>INTEGER</type>
                 <updatable>true</updatable>
                 <description>Estimated size of dataset in kilo bytes</description>
+                <standard>true</standard>
                 <unit>kbyte</unit>
             </property>
             <property>
@@ -89,12 +97,14 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>Astronomical object observed, if any</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>s_ra</name>
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Central right ascension, ICRS</description>
+                <standard>true</standard>
                 <unit>deg</unit>
             </property>
             <property>
@@ -102,6 +112,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Central declination, ICRS</description>
+                <standard>true</standard>
                 <unit>deg</unit>
             </property>
             <property>
@@ -109,6 +120,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Diameter (bounds) of the covered region</description>
+                <standard>true</standard>
                 <unit>deg</unit>
             </property>
             <property>
@@ -117,24 +129,28 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>Sky region covered by the data product (expressed in ICRS frame)</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>s_xel1</name>
                 <type>INTEGER</type>
                 <updatable>true</updatable>
                 <description>Number of elements along the first spatial axis</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>s_xel2</name>
                 <type>INTEGER</type>
                 <updatable>true</updatable>
                 <description>Number of elements along the second spatial axis</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>s_resolution</name>
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Spatial resolution of data as FWHM</description>
+                <standard>true</standard>
                 <unit>arcsec</unit>
             </property>
             <property>
@@ -142,6 +158,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Start time in MJD</description>
+                <standard>true</standard>
                 <unit>d</unit>
             </property>
             <property>
@@ -149,6 +166,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Stop time in MJD</description>
+                <standard>true</standard>
                 <unit>d</unit>
             </property>
             <property>
@@ -156,6 +174,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Total exposure time</description>
+                <standard>true</standard>
                 <unit>s</unit>
             </property>
             <property>
@@ -163,6 +182,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Temporal resolution FWHM</description>
+                <standard>true</standard>
                 <unit>s</unit>
             </property>
             <property>
@@ -170,12 +190,14 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>INTEGER</type>
                 <updatable>true</updatable>
                 <description>Number of elements along the time axis</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>em_min</name>
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Start in spectral coordinates</description>
+                <standard>true</standard>
                 <unit>m</unit>
             </property>
             <property>
@@ -183,6 +205,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Stop in spectral coordinates</description>
+                <standard>true</standard>
                 <unit>m</unit>
             </property>
             <property>
@@ -190,12 +213,14 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <type>DOUBLE</type>
                 <updatable>true</updatable>
                 <description>Spectral resolving power</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>em_xel</name>
                 <type>INTEGER</type>
                 <updatable>true</updatable>
                 <description>Number of elements along the spectral axis</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>o_ucd</name>
@@ -203,6 +228,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>UCD of observable (e.g. phot.flux.density, phot.count, etc.)</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>pol_states</name>
@@ -210,12 +236,14 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>List of polarization states or NULL if not applicable</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>pol_xel</name>
                 <type>INTEGER</type>
                 <updatable>true</updatable>
                 <description>Number of polarization samples</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>facility_name</name>
@@ -223,6 +251,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>Name of the facility used for this observation</description>
+                <standard>true</standard>
             </property>
             <property>
                 <name>instrument_name</name>
@@ -230,6 +259,7 @@ Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
                 <size>255</size>
                 <updatable>true</updatable>
                 <description>Name of the instrument used for this observation</description>
+                <standard>true</standard>
             </property>
         </add>
     </table>
diff --git a/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/CredentialsEditing.java b/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/CredentialsEditing.java
index a5e4e7154b5cb6016e767d283360217865dc3b01..48e1b0fd7bd3f6c722aca898d207b21aa507b2d3 100644
--- a/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/CredentialsEditing.java
+++ b/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/CredentialsEditing.java
@@ -66,6 +66,7 @@ public class CredentialsEditing implements Serializable {
     private boolean credentialsDialogOpened;
 
     private List<String> tapSchemaVersions;
+    private List<String> obscoreVersions;
 
     private boolean separateCredentials;
     private Credentials sourceCredentials;
@@ -73,10 +74,12 @@ public class CredentialsEditing implements Serializable {
     private String tapSchemaName;
     private String tapSchemaVersion;
     private boolean hasObscore;
+    private String obscoreVersion;
 
     @PostConstruct
     public void init() {
         this.tapSchemaVersions = SchemaModels.getAvailableTapSchemaVersions();
+        obscoreVersions = SchemaModels.getAvailableIvoaSchemaVersions();
     }
 
     public List<TapCredentials> getSavedCredentials() {
@@ -106,6 +109,7 @@ public class CredentialsEditing implements Serializable {
         tapSchemaName = credentials.getTapSchemaName();
         tapSchemaVersion = credentials.getTapSchemaVersion();
         hasObscore = credentials.isHasObscore();
+        obscoreVersion = credentials.getObscoreVersion();
     }
 
     public void addNewCredentialsInEditing() {
@@ -116,6 +120,7 @@ public class CredentialsEditing implements Serializable {
         tapSchemaName = "";
         tapSchemaVersion = "";
         hasObscore = false;
+        obscoreVersion = "";
     }
 
     public void loadTapSchema(TapCredentials tapCredentials) throws SQLException {
@@ -174,9 +179,10 @@ public class CredentialsEditing implements Serializable {
             editedCredentials = new JoinedCredentials(sourceCredentials);
         }
 
-        editedCredentials.setHasObscore(hasObscore);
         editedCredentials.setTapSchemaName(tapSchemaName);
         editedCredentials.setTapSchemaVersion(tapSchemaVersion);
+        editedCredentials.setHasObscore(hasObscore);
+        editedCredentials.setObscoreVersion(obscoreVersion);
 
         if (credentialsInEditing == null) {
             // New credentials
@@ -191,8 +197,8 @@ public class CredentialsEditing implements Serializable {
         return tapSchemaVersions;
     }
 
-    public void setTapSchemaVersions(List<String> tapSchemaVersions) {
-        this.tapSchemaVersions = tapSchemaVersions;
+    public List<String> getObscoreVersions() {
+        return obscoreVersions;
     }
 
     public boolean isSeparateCredentials() {
@@ -250,4 +256,12 @@ public class CredentialsEditing implements Serializable {
     public void setHasObscore(boolean hasObscore) {
         this.hasObscore = hasObscore;
     }
+
+    public String getObscoreVersion() {
+        return obscoreVersion;
+    }
+
+    public void setObscoreVersion(String obscoreVersion) {
+        this.obscoreVersion = obscoreVersion;
+    }
 }
diff --git a/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/TapSchemaLoader.java b/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/TapSchemaLoader.java
index ff5951be8f076524cb100a1c36140ca560a79790..1095927769155e8765119588437ae920e0fa2eed 100644
--- a/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/TapSchemaLoader.java
+++ b/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/TapSchemaLoader.java
@@ -23,6 +23,7 @@
 package it.inaf.ia2.tsm.webapp;
 
 import it.inaf.ia2.tsm.TapSchema;
+import it.inaf.ia2.tsm.TapSchemaSettings;
 import it.inaf.ia2.tsm.datalayer.DBBroker;
 import it.inaf.ia2.tsm.datalayer.DBBrokerFactory;
 import it.inaf.ia2.tsm.datalayer.DBWrapper;
@@ -95,6 +96,15 @@ public class TapSchemaLoader implements Serializable {
         // Otherwise create TAP_SCHEMA only if user press Ok on confirmation dialog
     }
 
+    private TapSchemaSettings getTapSchemaSettings(TapCredentials tapCredentials) {
+        TapSchemaSettings settings = new TapSchemaSettings();
+        settings.setTapSchemaName(tapCredentials.getTapSchemaName());
+        settings.setTapSchemaVersion(tapCredentials.getTapSchemaVersion());
+        settings.setHasObscore(tapCredentials.isHasObscore());
+        settings.setObscoreVersion(tapCredentials.getObscoreVersion());
+        return settings;
+    }
+
     public void edit() {
 
         loadedTapSchema = null;
@@ -105,7 +115,8 @@ public class TapSchemaLoader implements Serializable {
             @Override
             public void run() {
                 try {
-                    loadedTapSchema = new TapSchema(tapCredentials.getTapSchemaVersion(), dbWrapper, tapCredentials.getTapSchemaName(), true);
+
+                    loadedTapSchema = new TapSchema(dbWrapper, getTapSchemaSettings(tapCredentials), true);
                 } catch (Throwable e) {
                     LOG.error("Exception caught", e);
                     loadingError = e.getMessage();
@@ -128,7 +139,7 @@ public class TapSchemaLoader implements Serializable {
             @Override
             public void run() {
                 try {
-                    loadedTapSchema = new TapSchema(tapCredentials.getTapSchemaVersion(), dbWrapper, tapCredentials.getTapSchemaName(), false);
+                    loadedTapSchema = new TapSchema(dbWrapper, getTapSchemaSettings(tapCredentials), false);
                 } catch (Throwable e) {
                     LOG.error("Exception caught", e);
                     if (e.getMessage() != null) {
diff --git a/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/xmlconfig/TapCredentials.java b/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/xmlconfig/TapCredentials.java
index 2924a8176e9f86a7a0fbac50f11cdb57b8f7bf91..d615b0a75e312bc00f115779ce717bccd06f246f 100644
--- a/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/xmlconfig/TapCredentials.java
+++ b/TASMAN-webapp/src/main/java/it/inaf/ia2/tsm/webapp/xmlconfig/TapCredentials.java
@@ -36,6 +36,7 @@ public abstract class TapCredentials implements Serializable {
     private String tapSchemaName;
     private String tapSchemaVersion;
     private boolean hasObscore;
+    private String obscoreVersion;
 
     public TapCredentials() {
     }
@@ -73,4 +74,13 @@ public abstract class TapCredentials implements Serializable {
     public void setHasObscore(boolean hasObscore) {
         this.hasObscore = hasObscore;
     }
+
+    @XmlElement(name = "obscore_version")
+    public String getObscoreVersion() {
+        return obscoreVersion;
+    }
+
+    public void setObscoreVersion(String obscoreVersion) {
+        this.obscoreVersion = obscoreVersion;
+    }
 }
diff --git a/TASMAN-webapp/src/main/webapp/credentialsEditing.xhtml b/TASMAN-webapp/src/main/webapp/credentialsEditing.xhtml
index ab1f7dadf9278879b2430d5345d480acab7c0eda..577bccdf9eff111ca26d570e107343636306b0a9 100644
--- a/TASMAN-webapp/src/main/webapp/credentialsEditing.xhtml
+++ b/TASMAN-webapp/src/main/webapp/credentialsEditing.xhtml
@@ -38,6 +38,7 @@
                                     <th>TAP_SCHEMA name</th>
                                     <th>Version</th>
                                     <th>Obscore</th>
+                                    <th>Obscore version</th>
                                     <th>Login</th>
                                 </tr>
                             </thead>
@@ -67,6 +68,7 @@
                                         <td>#{c.tapSchemaName}</td>
                                         <td>#{c.tapSchemaVersion}</td>
                                         <td><span class="glyphicon glyphicon-#{c.hasObscore ? 'ok':'remove'}"></span></td>
+                                        <td><h:panelGroup rendered="#{c.hasObscore}">#{c.obscoreVersion}</h:panelGroup></td>
                                         <td>
                                             <h:commandLink  action="#{credentialsInsertion.loadTapSchema(c)}" title="Login" immediate="true">
                                                 <span class="glyphicon glyphicon-log-in"></span>
@@ -241,10 +243,20 @@
                                     </div>
                                     <div class="form-group">
                                         <label class="col-xs-6 col-xs-offset-4">
-                                            <h:selectBooleanCheckbox value="#{credentialsInsertion.hasObscore}" id="has-obscore" />
+                                            <h:selectBooleanCheckbox value="#{credentialsInsertion.hasObscore}" id="has-obscore">
+                                                <f:ajax execute="@form" render=":main:credentials-modal-body" />
+                                            </h:selectBooleanCheckbox>
                                             Has obscore
                                         </label>
                                     </div>
+                                    <h:panelGroup class="form-group" rendered="#{credentialsInsertion.hasObscore}" layout="block">
+                                        <h:outputLabel for="obscore_version" class="control-label col-xs-4">ObsCore version</h:outputLabel>
+                                        <div class="col-xs-6">
+                                            <h:selectOneMenu value="#{credentialsInsertion.obscoreVersion}" class="form-control">
+                                                <f:selectItems value="#{credentialsInsertion.obscoreVersions}" var="version" itemLabel="#{version}" itemDescription="#{version}" id="obscore_version" />
+                                            </h:selectOneMenu>
+                                        </div>
+                                    </h:panelGroup>
                                 </div>
                             </h:panelGroup>
                             <div class="modal-footer">