You have to do a REPLACE

REPLACE v_ViewName.Field WITH goApp.oUserMgr.cUserID

If you actually know this value at the time of adding the new record, you will be better off doing this in the OnNew method like this.... instead of during the PreSaveHook.

LOCAL loSelect

*-- Run parent class method.
= DODEFAULT()

*-- Make sure you are working in the proper work area.
loSelect = This.SelectAlias()

REPLACE v_ViewName.Field WITH goApp.oUserMgr.cUserID


>OK, the PreSaveHook sounds like the right place.
>
>What is the best way to write to a field value? I thought I could do something like: v_ViewName.field = goApp.OUsermgr.cuserID, but the wrong data session is open.
>
>Thanks VERY much for your help, I am still learning a lot about MM.
>
>Greg