Oracle Delete Trigger - Constrain Delete to 1 Row

I want to create a trigger to limit the delete to 1 row per delete. This is prevent users from accidentally removing more records than they want. The schema uses cascase deletes. I tried some thing like this.

Any help is appreciated

AP_ARCHIVE_VIEW_ALL is a view into the table.

DECLARE
   PRAGMA AUTONOMOUS_TRANSACTION;
   cnt PLS_INTEGER;
   multiRow EXCEPTION;
BEGIN
   cnt := 0;
   SELECT COUNT (*)

     INTO cnt
     FROM AP_ARCHIVE_VIEW_ALL;

   IF cnt > 1
   THEN
     RAISE multiRow;
   END IF;
EXCEPTION
   WHEN multiRow
   THEN

     RAISE_APPLICATION_ERROR (-20002,
                              'Can only delete 1 archive record at a time'
                             );

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