That should be
Forms!frm_MainForm!frm_Test2.Form.VS_Type
(a . before Form, not a !)
Also, make sure that the name of the subform control on frm_MainForm is
actually frm_Test2. Depending on how frm_Test2 was added as a subform, the
name of the subform control may be different than the name of the form being
used as a subform. It's the name of the control you want.

Signature
Doug Steele, Microsoft Access MVP
http://I.Am/DougSteele
(no e-mails, please!)
> How about this for a try:
>
[quoted text clipped - 16 lines]
>>
>> It is very urgent.
Maurice - 05 Jul 2007 14:18 GMT
Hi Doug,
You are right i will be punishing myself for that one... Thanks for the
correction.

Signature
Maurice Ausum
> That should be
>
[quoted text clipped - 27 lines]
> >>
> >> It is very urgent.