Diagnosis
For numbering concept 'K004' of extended withholding tax:
The reference key 3 is used for store withholding tax certificatenumber. This field will be required when posting document withwithholding tax type which activate the numbering. Normally, thisfield will be default with its document number.

System Response
Program terminated.

Procedure
In document change transaction, go to detail-screen of vendor orcustomer item , enter withholding tax certificate number in referencekey 3 before save or use withholding tax type which not required thenumbering. This certificate number is used in w/tax sequentialnumbering. The same sequence number will be assigned to samecertificate number.
This field must appear in the entry screen by customizing the fieldstatus group of control account.