RFX Response Header Table Extension Add button functionality not working

Dear All,

I have enhanced RFX response header with table extension. Tab is visible with empty table.

I have activated both Add and Delete buttons. Buttons are also visible.

But when I press on 'Add' button, it doesn't append line to table. So, Add button functionality is not working.

When I debug in BADI 'BBP_DOC_CHANGE_BADI' implementation, inside BADI its showing one blank line as table row.

But at portal this lines are not visible.

Also, I have observed from source code that lines are deleted because those lines does not exists in Bidding document.

Kindly help.

Thanks and Regards,