Closing PO's

I have a user who sent the following email.  I'd like some additional 
input from the group before I send a reply.

Is there a way for purchasing to CLOSE a purchase order with receipts 
against it and a balance due?  In the past, I've completed the line, 
bringing the balance to zero without the 
additional receipt to the line and accounting has done something to 
actually close the purchase order. (3 way match). 



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