Embded form as subform and validation

[balu]

I have an form name mainform that is login form with cmd buttons to open
other forms
on click event of button on mainlogin form ,form2 will open
on the form 2 i have an embeded subform ,form3 which is based on a query
now i created an event
form2_beforeupdate(cancel as integer)
dim press as string
if form!form2!subform!form3.[x] >form!form2!subform!form.[y] then
press=msgbox("x can't be > y")
cancel=true
endif
endsub
kindly advise what is wrong with code and also advise how to refer
such form built on querys to refer on main form events please
balu
india