Duplicate check is performed under any of below conditions :

Invoice number and ERP vendor number.
ERP vendor number and amount.
Beneficiary / Payee name and amount.
Invoice number and amount.
IBAN and amount.
Payee Bank Account details and amount.

Possible duplicate payment request found with the following details, please close this message and either cancel the request or enter justification as to why it’s not a duplicate in the reason for similar payment field on the payee data tab.