cross check query

[balu]

respected ,
kindly help me with this problom
table items
field item(pk)
''''''''''''''''''''''''''''''''''''''''''''
table entrycheck
field date
" item(fk)
" openingbalence
''''''''''''''''''''''''''''''''''''''''''''''''''
now i got an form(items) in form view and subform(entrycheck) in datasheet
view
i must confirm the user has taken the openingbalence for all the (items ) in
the field
item of the table items before the usercould press any command button .
i wnat to attach the code to the command button
how to do it please