The WITH TRIGGER REFERENCES Keywords

You must include the WITH TRIGGER REFERENCES keywords when you use the EXECUTE PROCEDURE statement to invoke a trigger procedure.

A trigger procedure is an SPL routine that EXECUTE PROCEDURE can invoke only from the FOR EACH ROW section of the Action clause of a trigger definition. Such procedures must include the REFERENCING clause and the FOR clause in the CREATE PROCEDURE statement that defined the procedure. This REFERENCING clause declares names for correlated variables that the procedure can use to reference the old column value in the row when the trigger event occurred, or the new value of the column after the row was modified by the trigger. The FOR clause specifies the table or view on which the trigger is defined.