>>What if the ControlSource is a complex expression? How would we determine if it's an expression or a real field?
>
>Right... I think
>
>

lcAlias=juststem(.controlsource)
>if lcalias#.controlsource and used(lcAlias)
>   * we have a table
>else
>   * not a table - check whether it's a property, variable etc
>endif

Thanks, Dragan. I found that in CreateTag method that used the original Vlad G code I have code like that checking for the expression already. In the SetOrder method I just added check for used() for now.

BTW, since I got your attention - do you know where this may be coming from

"Your changes could not be saved. A transaction can not be started"