Regd: Incomming Excise Invoice

Hi Experts

     Please have look on below scenario and give your suggestion how can we handle in SAP B1.

     1. My Customer purchasing material from Vendor called "X".(Payment Term: 7 days)

     2. Vendor will directly send the material to Subcontractor called "Y" as per my customer's instruction.(my goods may come after 30 days)

     3. My customer need pay to vendor in 7 days. But my customer do CENVAT Credit only after Receiving goods from subcontractor.

     How can we give solution in SAP B1 for this scenario?

I gave following options

     1. A/P down payment - But Customer not satisfied because the down payment will show as advance.

     2. On Account Payment -        -do-