AP -Prepayment -How to get the balance details

Hi

Our Version is :R12.1.3

In AP - a prepayment invoice is  generated and paid for 1000 $  to  supplier X. (table is  -AP_Invoices_all)

There  are many such payments against many suppliers  available in AP.

And..

1. Payment is not linked any invoices.
2. Transferred to GL
3. In GL Trial Balance  such balance is shows under  'Advance to Supplier'   -say  25000$

Now we need to know  - supplier wise balance  for  this  25000$. 

Is there any standard report available in GL or can someone refer the document  which provides table link./Queries.

Thanks