How the supplier liability account is deriving on payable invoice for Intra company vendor

How the supplier liability account is deriving on payable invoice for Intra company vendor

Need to some changes in supplier liability account combination for intra company vendor - Inter company vendor i did changes on supplier site -Site Assignments- Liability distribution and can see it working fine while creating the AP invoice. but same solution not working for Intra company vendor.

what should be done to achieve this for Intra company vendor?