How can I define a own exception

Hallo,
I want to delete rows in a table after pressing the "Delete"-Button.
When pressing "delete" the message box htmldb_delete_message is shown.
When pressing "Ok" the row will not deleted if there are depending rows in another table. On the Form the Error "ORA-02292: Integritäts-Constraint (EV_ADM.SEM_TEILNAHME_PN_FK) verletzt - untergeordneter Datensatz gefunden" is displayed. For this ORA--message I want to create a own exception and displays a message that the user can understand. How can I do this?
Thanks, Daniela

See also
how to avoid ora-errors to be displayed
for a similar discussion, and a solution. Follow also the links in teh posts !
Leo

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How can I define a own exception

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