Duplicate Purchase invoice issue

Currently, the system allows the same invoice number to be recorded multiple times for the same vendor, which creates a risk of duplicate invoice postings and duplicate payments.

We request the implementation of the following system controls:

• Invoice Number should be a mandatory field for all vendor invoices.
• The system should validate invoice numbers against the vendor master record.
• If an accountant attempts to record an invoice with an invoice number that already exists for the same vendor, the system should block the transaction and display an error message.
• The system should not allow duplicate invoice numbers for the same vendor under any circumstances.