Substitution for OBYA Accounts

Hi all,

I have the requirement to substitute the accounts used in OBYA when the document type "CO" is used. (S/4 HANA environment).

I tried the following FI substitution in callup point 2 (line item):

Prerequisite:

BKPF-BLART = 'CO' AND BSEG-KTOSL= 'BUV'

Substitution:

BSEG-HKONT = '999999'

The above substitution is not working when KSU5 is executed (intercompany cost center assessment). In KSU5 we allocate cost from one company to another company. In S4 HANA for the cost center assessment a FI document with document type CO is generated. And in this document we would like to substitute the balance sheet account.

I tried also the prerequisite with BSEG-HKONT = '123456' and also with BKPF-TCODE = 'KSU5'.

In general the BSEG-HKONT substitution is working when I perform FB01 posting. The settings in GB01 and OBBH are correct. And I also considered the program RGUGBR00.

Does anyone of you have a solution?

Thanks!