Updating NAST from batch program

After VF02 sends output to NAST, I have a requirement to process the NAST entries (Invoices) into files by customer. My program successfully reads the NAST (unprocessed) records and creates the files. I then use FM (RV_MESSAGE_SET_PROCESS_STATE) and it successfully updates the status in the output to success but, it doesn't update the processed date NAST-DATVR or processing time NAST-UHRVR. How can I update these as well?