Ordering address

Dear expert,

I try to create 1 vendor with two different address. One is for head office vendor and one for branch of the vendor. I already create two vendor number.

In head office vendor i set partner function OA with vendor head office number and vendor branch number, then i also use VN for this vendor.

In vendor branch (account group 006 , ordering address) i enter OA in partner function view and enter the number of branch vendor.

But, why when i create PO with head office vendor number, then pop up appear to choose two ordering address, but, when i choose branch vendor address, the address of head office vendor that appear in the PO..

what is missing?

point will be reward