I'm having trouble with a PO that I attempted to post. Instead of posting like normal it now says released and remains in the Purchase order list as released. Normally when I post (receive and invoice) it gets removed from the purchase order list and the system tells me that it has been moved to the posted invoices. For this particular PO it just remains as released, why? What am I missing? Every other PO I have posted gets moved out of the Purchase Orders list.