Perhaps the 1st thing to do is figure out if during Aatrix eFile if PR_40 ends up getting refreshed (from PR3 I guess). No point in fixing PR_40 if it's going to get overwritten anyway. To test you could make a backup of PR_40, then DFDM change 1 employee Fed record, then go into Aatrix and see if your changed number shows up or the one (from PR3) overwrites it.