This is an error generated in Loblaw's system regarding an invoice that came through with an incorrect invoice date. The invoice date needs to match the date that the invoice is sent. This error will also be produced if you are sending your invoice more than thirty days after or more than forty-eight hours before the order's ship date. Loblaws has rejected this invoice and has requested that it be corrected & re-sent.
Please remember that when you re-send your invoice to Loblaw, you should never use the exact same invoice number, even if the first version of that invoice was rejected. We usually recommend putting a small letter a at the end of your invoice number to avoid confusion for you and so that Loblaw's system can accept it.