Posting with withholding tax is not possible with obsolete modification

What causes this issue?

The modification from SAP Note 672040 is implemented in your system.
This modification applies up to and including EHP6, which means that
unlike the standard behavior, the sending system of an ALE scenario
calculates the enhanced withholding tax base amount and saves it in the
FI document.
As of EHP7, SAP Note 672040 is obsolete. If you want to continue to use
the functionality outlined, you need to use the modification from SAP
Note 1821352.

System Response

The document cannot be posted.

How to fix this error?

Remove SAP Note 672040 from your system and implement SAP Note 1821352
instead.
SAP Note 1821352 has not been released generally; please contact SAP by
creating a customer message (component FI-GL-GL-M).

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.