Field/Screen Exit for MIRO

Hi Friends,

The client requirement is to fix an Exit to disable or inactive the field INVFO-LIFRE or to put the INVFO-LIFRE field (invoice party in Details tab) as display mode where the user not able to change it while posting invouces in MIRO.

I've tried by program screen enhancement in 'SAPLFDCB' but i couldn't able to fix it since the screen name of INVFO-LIFRE is not showing/coming while posting MIRO (checked in debugging mode).

Instead of fixing error message through BADI/USER EXIT, is there any way to make field/screen exit to disable or inactive the filed??

Please advise.

Thanks & regards

Sankar.