Why is there a duplicate of an invalidated invoice in the system?

MediusFlow does not check for duplicates among invalidated invoices during document import. This means a new invoice will be created even if it has the same number, supplier, and company as an existing, invalidated invoice. A new invoice will not be created, and the imported document will be marked as a duplicate, if the original invoice with the same number is not invalidated (e.g. is active or archived).

For more information about invoice import validation, see Document Import Validation Block Configuration.