Master / detail form - more than one link fields


I use Delphi 4.0 + update #1.
I tried to create master / detail form, where Master Table and Detail Table
are connected by two fields. Both tables have defined proper indexes and
field names, however I can not choose two fields (it is possible to choose
only one) in Fields Link Designer.

I tried to enter joining fields manually (separated by ';'), but then I
received run time error ("Field Index out of range'). Delphi documentation
says, that there is no problem in joining with more fields, but it doesn't
work or I'm doing something wrong.

Has anybody got any idea?

Thank you,