Diagnosis
One of the following situations triggered this message:
You want to create management records for task lists in this changenumber, or you have chosen menu option Goto, function Objectoverview -> Task lists.
However, this is only possible if the following indicators are set forthis object type:

• Object type active for change number


• Management record required for each object

You want to allocate one or more task lists to an alternative date youselected.

Procedure
1.)
If you want to process object management records, first set bothindicators for the object type task list.
If you want to define the indicators more precisely for the differenttypes of task list, choose the Edit menu, function Objectsub-types -> Task list.
If it is not possible to change this change master, choose a differentchange number which contains these indicators.
2.)
You cannot change the valid-from date in the change header fortask lists. For this reason, you cannot allocate task lists to analternative date.