How to create a form on a table with 3 columns for a PK

Hi All,
We have a table that has 3 Columns that form the Primary Key and I would like to create a form based on that table; unfortuanately on the 'Create Form Page' there's only 2 options that identifies the first and second PK columns.
Is there a way I could add the third PK column.
Kind regards
Mel

Maybe this can help:
http://apex.oracle.com/pls/otn/f?p=31517:157
using instead of trigger on a view.
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
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