--Execute as oe/oe
SET SERVEROUTPUT ON
INSERT INTO pOrder
  VALUES (500, 50, 5000, sysdate, typ_item_nst(
     typ_item(55, 555),
     typ_item(56, 566), 
     typ_item(57, 577)));

INSERT INTO pOrder
  VALUES (800, 80, 8000, sysdate,
    typ_item_nst (typ_item (88, 888)));
