I'm going to assume that Field1 gets its values from a table named TblMenu
and the primary key is MenuID. Further I am assuming that Field1 combobox
displays Text1, Text2, Text3, Text4 or Text5 but actually has the value 1,
2, 3, 4 or 5.

A form's BeforeUpdate event fires when a value has been added, deleted or
edited in any control on a form. To do what you want, put the following code
in the form's BeforeUpdate event:
Select Case Me!Field1
Case 1,2,3
If IsNull(Me!Field2) Then
MsgBox "Field2 Must Be Populated"
Cancel = True
End If
Case Else
End Select

Steve





"andrew w" andrew wrote in message
...
I have two fields and I wish to validate one to depend on the other

This what I would like to happen

if field1 = text1 or text2 or text3
field2 must be populated
If field1 = text4 or text5
Field2 does not need to be populated

Field1 is a drop down menu with 5 text options field2 is an integer I want
field2 dependent on field 1
I have tried the iif function at table level and it didn't work is there
another option?
I'm using 2003