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The duplicate supplier invoice checker produces a CSV file detailing duplicate invoices to ensure that you are not paying suppliers more than once.
Whenever you want a report on whether duplicate supplier invoices have been entered onto Sage Accounts, select the "Supplier invoice ex. ref uniqueness checker" option from the list of operations on the Sage 50 Accounts tab:
Select the start and end date of the range you wish to check, and then click "Continue":
You will be presented with a view of a CSV report in Microsoft Excel® (if you have Excel installed) so you know which invoices to go into Sage and check up on should there be any duplicates.