diff --git a/.liquibase/Data_alias/basic/2021.1.2/ModularCommunication/add_CommunicationObjectType.xml b/.liquibase/Data_alias/basic/2021.1.2/ModularCommunication/add_CommunicationObjectType.xml
index e1050eea0b9a4a9bf6acbd356f669102518f7982..85d0e99ec63e0f3126a4cd7372e9aff79eedb4c5 100644
--- a/.liquibase/Data_alias/basic/2021.1.2/ModularCommunication/add_CommunicationObjectType.xml
+++ b/.liquibase/Data_alias/basic/2021.1.2/ModularCommunication/add_CommunicationObjectType.xml
@@ -20,7 +20,7 @@
         <column name="OBJECT_ROWID" valueComputed="CONTACT_ID"/>
         <column name="OBJECT_TYPE" value="Contact"/>
     </update>
-    
+    <dropIndex tableName="COMMUNICATION" indexName="IDX_COMMUNICATION_CONTACT_ID" />
     <dropColumn tableName="COMMUNICATION">  
         <column  name="CONTACT_ID"/>  
     </dropColumn>  
diff --git a/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationStorage.xml b/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationStorage.xml
index e22019fb52b91ee6bf4e5efaf76e3c8b46986e51..0f97bd560b3f15252b3336c11b0e0fe42ff4988a 100644
--- a/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationStorage.xml
+++ b/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationStorage.xml
@@ -2,6 +2,12 @@
 <databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.6.xsd">
     <changeSet author="b.ulrich" id="7eb72f9e-1d36-4174-97cb-062e40f72bf7">
+        
+        <!--Needed for MS SQL, otherwise the column can't be deleted-->
+        <dropDefaultValue
+            columnDataType="int"  
+            columnName="OUTDATED"
+            tableName="CLASSIFICATIONSTORAGE"/>  
         <dropColumn tableName="CLASSIFICATIONSTORAGE" columnName="OUTDATED"/>
     </changeSet>
 </databaseChangeLog>
diff --git a/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationType.xml b/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationType.xml
index 33d20b01fb410ca837602c229d678149231266a2..c9989432be46a7dcfc23874de0da41ac1407233f 100644
--- a/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationType.xml
+++ b/.liquibase/Data_alias/basic/2021.1.3/Classification/alter_ClassificationType.xml
@@ -2,6 +2,12 @@
 <databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.6.xsd">
     <changeSet author="b.ulrich" id="21094fcf-539e-4514-8986-e681747a33e2">
+        
+        <!--Needed for MS SQL, otherwise the column can't be deleted-->
+        <dropDefaultValue
+            columnDataType="int"  
+            columnName="OUTDATED"
+            tableName="CLASSIFICATIONTYPE"/>  
         <dropColumn tableName="CLASSIFICATIONTYPE" columnName="OUTDATED"/>
         <addColumn tableName="CLASSIFICATIONTYPE">
             <column name="SORTING"  type="SMALLINT" />