SAP Message 8H025 - No w/tax cert-no.(XREF3) or w/tax amount is zero

Diagnosis
The document has the correct calculated data but incomplete in furtherinformation:-
- No certificate number assigned in reference key 3
- No withholding tax amount

System Response
No sequential number generated for w/tax certificate.

Procedure
Correct the document with the following:-
- The reference key 3 must be filled with withholding tax certificatenumber.
- The withholding tax amount must not equal to zero.