Duty Posting has been posted twice

Question

Hello Experts,
The start of Debugging Phase will be on Create Billing Document VF01.
The issue of the user lies on the Accounting Document created upon Billing. On the Document Flow the Accounts were posted twice having the same Assignment Field.
Instead of Reversing the Account, the system had double post the SIT Duty Account and COS Excise Duty.
The expected outcome should be:
50 MK1 22051 SITDutyUp Wh Spirit 34787653 -10,087.50 GBP
40 MK1 45000 COS Excise Duty     34787653  10,087.50 GBP
40 MK1 22051 SITDutyUp Wh Spirit 34787653 -10,087.50 GBP
50 MK1 45000 COS Excise Duty     34787653  10,087.50 GBP
And not: 
50 MK1 22051 SITDutyUp Wh Spirit 34787653 -10,087.50 GBP
40 MK1 45000 COS Excise Duty     34787653  10,087.50 GBP
50 MK1 22051 SITDutyUp Wh Spirit 34787653 -10,087.50 GBP
40 MK1 45000 COS Excise Duty     34787653  10,087.50 GBP
Where can i start debugging this?what specific user exit can i debug to trace the problem.
I appreciate your help guys
Thanks!

Answer 1

Dear Jan,
Please do settings as per below SAP Note:
*Note 551932 - Cancellation of Billing with Excise invoice
Note Language: English Version: 2 Validity: Valid from 05.09.2002*
Summary
Symptom
When a billing document is cancelled, the attached excise invoice also gets
reversed. Again the user can go and cancel the excise invoice independently
through CIN making double accounting of the reversal.
More Terms
Excise invoice, Cancellation of excise invoice, j1iH, VF11
Cause and Prerequisites
This is because of the new cancellation procedure of the billing.
This happens because the accounting document for Excise invoice posting is
linked to the document flow of SD. So when you cancel the billing all the
related accounting documents are reversed.
Solution
This is because of the new Billing cancellation procedure. You have to
implement the userexit mentioned in note 339928. This will ensure that the
cancellation of excise invoice works as it used to do before the new
cancellation procedure.
In the userexit userexit_fll_xkomk1 in function rv_accounting_document
create add the code attached below. The userexit is in rv60bfza. This will
not get overwritten in upgrades.
FORM USEREXIT_FILL_XKOMK1.
rule_new_cancel = 'A'.
ENDFORM.
This will ensure that excise invoice related accounting document is not
reversed at the time of billing. You may use the existing functionality to
cancel the excise invoice
*Related NotesNumber Short Text
339928 New cancellation procedure cannot be deactivated*
Regards,
Barathi S.