Try:
IF irmpok = .f.
thisform.txtirpm1.setfocus()
nodefault
ENDIF

Other approach may use textbox.valid, but instead of setfocus you will need to return numeric value(+/-) specifies the number of controls the focus advances (with +) or moves back (-).

>That's what I thought, but it is not working. Here is the code I have in the LostFocus area:
>
> IF irmpok = .f.
> thisform.txtirpm1.setfocus()
> ENDIF
>
>The variable irmpok is returning false, I did check that.
>
>txtirpm1 is the field I want to go to.
>
>Any ideas?