Hi Prasanti ,
What you can do is call the BAPI first and fill all the remaining fields. For REVLV field , immediately after the BAPI is called , you can write an update statement , to update the REVLV field in the database table directly. For that , you will need to use "where used list" to find out in which tables the field REVLV is used . Out of that , you will get some relevant 1-2 tables related to CO11N transaction.
Regards
Amber Garg