将File2.StockT更新为与File1.StockT相同

Question

UPDATE CRPDTA.F4102                    
SET IBSTKT = IMSTKT FROM CRPDTA.F4102 INNER JOIN CRPDTA.F4101 ON F4102.IBITM = F4101.IMITM         
WHERE ((F4102.IBMCU IN ('      259100')) AND F4102.IBSTKT = 'O' AND F4101.IMSTKT = 'P')