A duplicate check is a Customer Order Processing function that ensures that the same combination of item and confirmed delivery date do not occur in a customer order.
Duplicate checks are used to avoid errors that can occur when an item is entered on more than one order line for the same confirmed delivery date.
The check is activated in the customer order type in 'CO Type. Open' (OIS010) and the check is done during customer order entry.
Two possible errors that can be avoided using a duplicate check are: