Suresh,
Thanks again but things are still not behaving.
The vendor invoice that I'm creating is for a PO that has retention terms but all the ordered quantities have been received and invoiced. The invoice button is still active for the purchase order in question but when I try to invoice, nothing is available in the invoice line since everything ordered has been received and invoiced. So I guess I'm stuck. Does it mean you cannot "release all" if all the quantities has been received and invoiced?