Maintain the reversal indicator
Message type: E = Error
Message class: >4 - Contract A/R and A/P: Document posting
Message number: 209
Message text: Maintain the reversal indicator
What causes this issue?
You have maintained either the field "Reversal date" or "Run ID", but
have not set the reversal indicator. To be able to identify and then
reverse a transfer posting run that has already been carried out, you
must set this indicator.
System Response
The system cannot continue processing.
How to fix this error?
If you want to reverse a transfer posting run that has already been
executed, set the reversal indicator. Alternatively, delete the entries
in the fields <LS>Reversal date</> and <LS>Run ID</>.
Procedure for System Administrators
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.