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.