APP-SQLAP-10715 This purchase order closed for invoice. You may want to review purchase order before continuing with this match.

Matching an invoice to a PO for the entire quantity closes the PO for invoicing.

When the matched invoice line is discarded (using the Discard button), this reverses the PO match. 

The Match button is again available, so the invoice is matched again to the same PO for a different quantity. 

At that time, the following message occurs: 

APP-SQLAP-10715: This purchase order line is closed for invoicing. You may want to review the purchase order before continuing with this match.

Solution: 

In R12, when we discard the line, the status is updated only at validation time. 

Similarly, we update the quantity billed and amount billed for PO's when we match or reverse, but the status is affected ONLY when we validate the invoice. 

So, after pressing the Discard button, validate the invoice before proceeding with any other actions on the invoice.