SAP Message TU201 - Function not possible - no changeable due dates exist

Diagnosis
The function you have chosen cannot be executed; after checking thebudget billing plan, the system established that no modifiable duedates exist. Possible reasons for this are as follows:

  • Due dates have been transferred the installment plan

  • The due dates are in the past

  • No more open due amounts exist

  • Partially paid due amounts exist

  • All requests have already been printed

  • The budget billing plan has been deactivated

210450BBP: Advance payment cannot be deactivated