Fipp,
This error can occur when the ControlSource is self-referential, such as, in
a control named City:
= [City] & ", " & [State] & " " & [Zip], it refers to itself.
This can also be triggered by an incorrect spelling or reference to controls
named in the ControlSource, or an ambiguous reference caused by a form
control named the same as a field in the form's underlying RecordSource. For
the latter reason, it is standard practice to rename all form controls by a
naming convention. The most accepted convention uses a 3-character prefix to
ID the control type, followed by the name of the field to which it's bound,
or a meaningful descriptor if it is Unbound--e.g., txtAddress, cboEmployeeID,
chkActive, etc.
It's difficult to tell from what you've said what might be causing the
problem. Please post:
- The names & ControlSources of both combo boxes on the new form.
- The name of the first form
- The name & ControlSource of the control on the first form that has the
value you'd like to use to set the DefaultValue properties of the new form's
controls.
- Your OnOpen event procedure code
Sprinks