In the Customer, Supplier and Subcontractor batch entry windows, the software runs checks for potential duplicate transactions. If there's a possibility that your transaction is a duplicate, a warning appears.
To flag a duplicates, transactions must have the same:
The software checks both the new transactions you're entering and previously entered transactions. You'll see a warning symbol in the column to the left of the 'A/C*' column.
If you have a lots of transactions, the duplicate check can cause a slight delay when entering batch transactions. You can check if it's activated and switch the feature off if required.