The predefined Data Definition is missing. This kind of change is not allowed and could harm proper functionality of application. The relation constraints of this class cannot be autofixed. It is advised to manually fix this problem.
Applies to all Data Definitions.
Detects problems caused by customer changes.
Manually fix the issue: please fix the NotNullable relation constraint and finish installation afterwards by applying the AutoFix. Please get in contact with Matrix42 support if necessary.