SAP Free Download Center: How to create SAP Error Message for the cancellation of paid billing document?

Can we create and SAP error message for the cancellation of paid billing document?

The scenario is:

SAP Accounting document is created upon creation of billing document. Upon
payment, document cleared is the accounting document created. There are instances wherein SAP accounting document was already cleared but our user is still able to reversed billing document. Now, i want to create an error message or user exist wherein, when a user will not be able to reverse the billing document if the SAP accounting document attached to this billing document is already paid.

The answer is yes, it's very well through SAP standard itself, you can address this SAP issue. Apply Routine 29 for the field Copying Requirements at header level in VTFL. Also Go to VOFA, select your billing type and assign routine 29 to the field "Copying Requirements". This should solve your problem.