PO Default issue

[niletra]

Version R12/11i? = R12
Instance PROD/TEST/VIS? = Prod
Module? = AP
OS? = Window 2003 Server

Hi

there is one PO no:101

i have take 3 Receipts Against it 201,202,203

Now

When i am Passing the 2 Bills(AP Invoice Against it)

One is

Invoice No 301 Matched against 201 Receipt

and

When i am Passing the secod Bill 302 against 202 and 203

Receipts at that time 201 Receipts is also appear in the Lov

I wan to prevent can you plz help me guys how to prevent it

Thanks

Best Regards,
Niletra Desai