For accounts payable
Go to Settings > Inbound > Accept
Check for duplicate documents-> ON
A warning is displayed when you import a duplicate:
Note: to determine duplicates, the following elements are checked:Amount
Invoice number
Invoice date
Supplier
Block archiving of duplicate documents -> ON
Prevents duplicate documents from getting accepted and archived again.
For accounts receivable
Go to Settings > Outbound
Check for duplicates -> ON
The total amount and invoice number get checked to determine if a document is a duplicate.
Block duplicate to be sent -> ON
Prevents you from sending an invoice that has already been sent to your customer.
Data enrichment status
An invoice gets the Data enrichment status when you try to accept the invoice but the system detected the invoice as a duplicate based on the following criteria:
Supplier
Document date
Document number
Total amount
In principle, there is already the same invoice in your account and you can delete the document with the Data enrichment status from the invoice details.
FAQ
A duplicate incoming invoice does not appear in "Filter tasks"
Are two copies of the same invoice sitting directly in your Accounts payable list (so not in the Filter tasks tab)? Then the same invoice was probably sent twice to your Billtobox email address.
Click Table options above the list and add the Received via column.
For both documents, compare the sender email address in the Received via column. If it is the same address, the supplier sent the invoice twice.
Delete one of the two copies.