Supplier Master Data Validation for DFF fields

We have a requirement to validate the Supplier DFF fields. There are two DFF attributes as BR Number and NIC.
When creating a supplier, the system should perform a validation to prevent duplicates:

• If the NIC already exists in another supplier record, the system should flag it as a duplicate.
• Similarly, if the BR Number entered is already used by another supplier, a validation message should appear indicating that the BR Number is duplicated.

This validation is needed to ensure that no duplicate suppliers are created in the system.