ora-04098 触发器无效且未通过重新验证

CREATE OR REPLACE TRIGGER update_bms_ord_record 
       AFTER UPDATE OF status ON oms.oms_order
       FOR EACH ROW 
         BEGIN 
           CASE  
             WHEN UPDATING('status') THEN 
               IF :NEW.status='SIGN' THEN 
                   UPDATE bms_ord_record ord SET ord.Be_Sign=1,ord.sign_time=:OLD.ACTUAL_RECEIVE_TIME WHERE ord.relatebill1=:old.relatebill1;
               ELSIF :OLD.status='SIGN'
                   UPDATE bms_ord_record ord SET ord.Be_Sign=0,ord.sign_time=NULL WHERE ord.relatebill1=:OLD.relatebill1;
               END IF;
           END CASE;
         END;

UPDATE oms_order o SET o.status='SIGN2' WHERE o.relatebill1='50010777';