Adding 'Your Reference'(VBKD-IHREZ) field to Field catalog in Output determ

The requirement is maintaining the condition table using Sales Org/Sales Doc Type/Your reference in output determination process. But the field 'Your reference(VBKD-IHREZ)' is not in the field catalog. Can someone tell me how to add the VBKD-IHREZ to field catalog?

Thanks in Advance.