We have control for duplicate invoices if reference number matches between the invoice then system gives us the message "Check whether document has already been entered under number & & &"
One document got posted with the same reference number and also matching with all other information as the other document - just a duplicate invoice.
Document Type: KR
Can you please let me know how it happend and what i should need to do to control the same.
Thanks for your help, i will assign good points.