If you receive the error message "No AP Scan Attached" it means that your production has scanning switched on and you have not entered a barcode sticker number in one of the transactions you are trying to post.
Solutions:
a) If just one user does not want to enter a barcode number on a transaction, the best way to get around this setting is to just enter in a fake barcode number into the field (ex. 111111)
b) The production can switch to Scanning Invoices with the Cheque Remittance. This will eliminate the need to enter and print off labels for AP Invoices.
c) The supervisor can also turn off the "AP Must Have Barcode" option under the System Defaults > Scanning tab.
Warning: This will allow all users to post invoices without inputting a barcode number.