unexpected intercompany update vendor for item master data

Hi experts,

In SAP B1 V8.82 PL 12 with Intercompany V1.1 PL3

Scenario:

There are 4 global partner branches with BP Code : C1 C2 C3 C4 (V1 V2 V3 V4) respectively.

For a global item A:

In C1 company, the preferred vendor would be V3.

In C2 company, the preferred vendor would be V4.

The unexpected result :

when select the preferred vendor V3.for global item A in company C1, the intercompany process will update this for all other branches.

But the preferred vendor should be V4 for global item A in company C2.

When I correct vendor V4 in company C2 that cause updating for C1 (since V4 is global BP.) But this is unexpected update.

How Can I fix this situation? Please help, the system is going to go live next week.

regards,

Hellen