My client require an reference field for their convenient while creating invoice in VF01.
i have checked in invoice but i couldn't fin any field in the screen.
Kindly suggest me or how can I bring that field in SAP
Can you check with your client as what information they want to capture in the referecne field.
May be there might be possibility that you can user the TEXT at header / item level to capture and print the same details.
Please check the criticality of the information the client want to capture and can be mapped throught TEXT.