The Supplier Invoice is made to forget the old information in the Manual and send the data to a File, an error, and the user forgot to Bill check out the date on the Invoice receiver, key error.
Since the Manual Invoice Supplier do not forget to change the old File and send data to a billing error and the user forgot to check the date on the Invoice key receiver makes mistakes.
Due to the Supplier do Invoice is Manual forgot to change the old data in File sent information to bill mistakes and user forgot to check the date. Invoice made key receiver mistake.