SAP Message 68191 - Only posting control '01' and '21' permitted for disbursement

Diagnosis
Only the posting control keys '01' (manual debit position) and '21'(manual posting, only via disbursement) are permitted for disbursement.
Note that if you use posting control '21' (manual posting), the recordsfor the current disbursement will not be captured by the automaticdebit postion run.
The posting control for the disbursement flow type also applies to allthe incidental costs which belong to the disbursement, even if you havedefined other posting control keys for their flow types.
However, this does not apply to flows which are only due on a laterdate (such as interest and repayment).

Example
You enter a disbursement on 30.03 of a particular year and save it as aplanned record. The the lead date for the withholding amount is also30.03. Interest and repayment are due on 31.03.
In such a case, the system would post the interest and repayment forthe planned disbursement during the debit postion run, but not thedisbursement itself. If you change or delete the disbursement after thedebit position run, the records already posted during the debitposition run may then be wrong.
Note that you can only reverse these records either after thedisbursement has been posted or if the disbursement is deleted.
You cannot delete the disbursement if it has been saved with postingcontrol '21'.