how can brought forward advance outstanding

Dear all,

 I want to  clear one point here, we are working on 11i and we want to implement r12 and during implement we would need to upload supplier balances.

Scenario : suppose we have one supplier "A" and he had took advance 500,000 on 30th Nov and we have defined in payables prepayment and raise the checks in the system. We still not recive any invoices. How we would upload this 500,000 in new system in payables and which account should effect in this way.

Kindly I would really appreciate detail of this scenario at subledger and ledger level.

Note: we can't repeat this transaction in the same way as we done in R11i, because check number has already raised in previous system, what could be the best solution