Auto application of reciepts

 Hello

We need to apply receipts automatically on invoices created through AUTOINVOICE from orders imported from OM.

Each receipt entered is against an ORDER number.Our client need is that on import of invoice created from that Order ,the receipt is automatically applied on the invoice.

i have seen the auto application rules ,but there is no such solution which allows for application of receipts against a specific invoice(with sale order number) automatically.

looking forward to prompt responses!!