SAP Note 15657 - Setting the work center category is not permitted.

Symptom:

If you want to create a work center with transaction CR01, you get the error message CR068 'Setting the work center category is not permitted' although the work center category has been maintained.

Cause and prerequisites

The task list application 'P' of the work center category is missing.

Solution
In Customizing transaction 'OP40' for setting the task list application of a work center category, you have to insert the application 'P' (routings for the production).