You haven't put TRIM() around your index expression or in the relation
expression, have you?
> I have just upgraded to version 5.0. Unfortunately the following
> problem appears in one to many forms.
>
> Example:
> The master table has an index like firm+customer+order
> The child table has an index like firm+customer+order+position
>
> If the field order is blank (in master and child table) all
> child records with this firm and customer are displayed and
> not only those which have the field order blank.
>
> Of course in this example it makes not much sense that the
> order field is blank.