The system is designed to display only the final bill number in reports, particularly in cases of partial billing against a single Consignment Note (CN).

This is the standard and expected behavior for the following reasons:

• Partial Billing: When multiple bills are generated for one CN (a scenario often called 'part billing'), the system tracks all of them but designates one as the final bill.
  
  
• Report Logic: Reports are configured to pull the unique 'Final Bill ID' that is saved in the master record for that consignment.

Therefore, even if two or more bills have been created, the report will correctly show only the single, final bill number associated with the CN.