fix

others/db_changes/data_alias/basic/2019.2/changelog.xml

@@ -37,5 +37,7 @@
     <include relativeToChangelogFile="true" file="data/example_task/base.xml" context="example"/>
 	
     <include relativeToChangelogFile="true" file="update_TaskType_Task.xml"/>
+    <include relativeToChangelogFile="true" file="removeTaskCode.xml"/>
+    
     <include relativeToChangelogFile="true" file="create_salutation.xml"/>
 </databaseChangeLog>

others/db_changes/data_alias/basic/2019.2/removeTaskCode.xml

+<?xml version="1.1" encoding="UTF-8" standalone="no"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog" xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.6.xsd">
+<changeSet author="j.goderbauer" id="598345d1-691b-4cae-b1c0-44c9c48705c8">
+    <dropNotNullConstraint tableName="TASK" columnName="CODE" />
+    <update tableName="TASK">
+        <column name="CODE"/>
+    </update>
+    <rollback>
+        <addNotNullConstraint tableName="TASK" columnName="CODE" />
+        <!--the update which sets everything to null cannot be rolled back-->
+    </rollback>
+</changeSet>
+</databaseChangeLog>