Order to billing copy control issue.

Hi Expert ,

Need advice.

The billing is sales order related .  In the copy control (transaction code: VTFA), The function 'Copy item number' (POSVO) is ON at header level .

But there is no entry for copy the item number' (POSVO) field in TVCPF table for item category combination.

My question where this field (POSVO) to be activate in configuration so that it will appear in item level ?

Thanks

DC