Posting receiving gives approval error

[mebenz]

PO is approved. User invoice matches PO with shipment/invoice with no issue. Posts batch and one of the receipts gives an error "purchase order has exceeded your approval authority amount. It will be saved with approval status of unapproved."

First thing, click okay and it does post. SEcondly, it does not go back and change it back to unapproved. Thirdly, there is no pattern to the ones that give errors. Makes no sense at all.