Withholding tax information ignored

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

The activity selected uses posting keys that are not payment relevant.
This meant the withholding tax was not processed even though documents
with withholding tax information were selected.
Start the transaction again with a new activity so as to include the
withholding tax information for the documents selected.

System Response

In Customizing you can switch off the message under
<DS:SIMG.SIMG_CFORFBOBA5BELE> Change Message Control for Document
Processing</> in Applic. Area '7Q'.

How to fix this error?

Check to see whether you can use a different activity or another
transaction (such as <DS:TRAN.FB05>FB05</>).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.