Isolated (first time I can remember) problem.
I have a valid PO reveiver (shows fine in PO-D), but when I get to AP-C to enter the invoice, I'm told "no open receiver...".
The receipt does not show in PO-I-F, but the  GL RNI account transactions shows only the (at-receiving) Credit, no (at-invoicing) Debit.  
And there isn't already an invoice for this transaction on the books.
What do I need to tweak so I can enter this invoice / pay my vendor?  Any ideas?
 
Thanks.

Another temporary fix is to enter the invoice manually through AP-B and charge the expense to the RNI general ledger account.
 
This clears it through the GL, since it doesn't appear on the RNI report, there is nothing to lose.
 
Only thing to check is the po to see if this receipt closes the purchase order.  If so, than you may have to manually close the PO.

No cleaner way.  That's what I would do.
 
As to why, I wish I knew.  Some people have this happen fairly often, others never.  It has to be something in either PO-C or AP-C but I can't figure out what.