Supplier liability account derivation in case of centralized invoicing and procurement

Summary:

Our current structure is multiple legal entities are attached to one single payables BU.

Procurement is centralized at one BU, and so is billing.

For e.g.

One ledger —> LEGDER 1

Multiple legal entities —> LE1 ( BSV1) , LE2 (BSV2)

Multiple requisition BU's - BU1 ( LE1), BU2 ( LE2)

One single BU for Invoicing—> BU1.

We have created multiple site assignments against the supplier site.

Record 1

Client BU: BU1

Bill to BU: BU1

Liability Account: BSV1. Liability

Record 2

Client BU: BU2

Bill to BU: BU1

Liability Account: BSV2. Liability

Now, when we are trying to create a PO matched Invoice with the below: