Cross-company code postings - FI validation

Question

Hi,
We start using the cross-company code postings (transaction OBYA) between company code A and company code B and have to give authorizations both company codes to the Finance users. The idea is to have a set of G/L accounts which are allowed to be used when company code A and B are posted via cross-company code posting.
SAP recommends to implement a validation in FI to restrict the Intercompany scenatios. I attempted to create a FI validation for complete document (call-point 3) with no success:
1)
IC Rule: BSEG-BUKRS = A and BSEG-BUKRS = B and BSEG-HKONT IN ACCOUNTSET
Prerequisite: TRUE
Check: IC rule
Message: E-  Account & not allowed for cross-company postings
When I test it, the Intercompany clearing account configured in OBYA, and which is in ACCOUNTSET, shows up in the error message, which unwanted.
2)
IC Rule 1: BKPF-BUKRS = '0017' AND BKPF-BUKRS = '0005'
IC Rule 2: BSEG-HKONT IN ACCOUNTSET
Prerequisite: TRUE
Check: IC Rule 1 --> IC Rule 2
Message: E-  Account & not allowed for cross-company postings
No error message is issued at all, even if the G/L account is not in ACCOUNTSET.
Please advise what I am missing.

Answer 1

Hi Nitin,
Thank you for your feeback.
I just wanted to clarify that the cross-company code posting is when company code A can intitiate a posting to company code B simultaneously (for example Intercompany re-charge, cash concentration, etc.). The trigger for cross-company code posting is the company code field on the line item. If company code A is in the header (BKPF-BUKRS) and at least one document line item filled up as company code B, the system created two documents for each company code, offsetting the Intercompany clearing account, configured in OBYA.
For example:
Posting via FB50: Leading company code = company code A (BKPF-BUKRS)
Item 1: Debit; G/L account 1; Cost Center 1; Amount 200; Company code A (as a default)
Item 2: Debit; G/L account 1; Cost Center 2; Amount 100; Company code B (manually changed)
Item 2: Credit; G/L account 2;                        Amount 300; Company code A (as a default)
The systen creates two postings:
Posting 1: company code A
Item 1: Debit; G/L account 1; Cost Center 1; Amount 200;
Item 2: Credit; G/L account 2;                        Amount 300;
Item 2: Debit ; I/C Clearing Account;              Amount 100;
Posting 2: company code B
Item 1: Debit; G/L account 1; Cost Center 2; Amount 100;
Item 2: Credit;I/C Clearing Account;              Amount 100;
The only connection between the two is the cross-company code number (BKPF-BVORG), which assigned by the system once posted, as a logical connection.
I guess we could use a dedicated document type. If that's the case, how would the validation work then?
Coudl you please share more details on the BTE option?
Thank you,
Inna