Not sure either. One thing to consider is that the Form's recordset can be updated without committing to the table. So if you do something like Me.Dirty = False, you are committing to the table. On the other side of the coin, if you exit or lose focus of a control, the Text property might affect the Value property of the control. In turn, this can affect the Form's recordset.

So, moving focus from a combo to another control could have an affect on the form's recordset.
Code:
Forms!FrmCust!FrmClaims.Form!DateOfInjury.SetFocus