Diagnosis
You attempted to replace a work center with a new work center that isassigned to a different cost center as the one used so far.
Note the following: If you have allocated an activity type tooperations, the system only replaces the old work center in theseoperations if the activity type is also valid for the new cost center.

Procedure
Choose a new work center that is assigned to the same cost center asthe work center you have used so far or use an activity type that isvalid for the new cost center.