What does “possible duplicate” mean?

A signal to compare the documents—not a reason to delete one blindly.

1. 1

   Compare both documents

   Check the supplier, invoice reference, date, and total. Look at the source documents, not just their filenames.

2. 2

   Check the existing accounting record

   Confirm the business and transaction involved. Establish whether the original invoice has already been processed.

3. 3

   Hold anything uncertain

   Resolve the warning before approving another entry. Ask support with the two document references when you cannot establish what happened.

Do not delete or recreate a transaction simply to remove a warning.