Hi, try
SALESDOCUMENT = 'XXXXXXXXXX'.
ORDER_HEADER_INX-UPDATEFLAG = 'U'.
ORDER_ITEM_IN-ITM_NUMBER = 10 .
ORDER_ITEM_INX-ITM_NUMBER = 10 .
ORDER_ITEM_INX-UPDATEFLAG = 'U' .
ORDER_ITEM_IN-REASON_REJ= '10'.
ORDER_ITEM_INX-REASON_REJ= 'X'.
APPEND : ORDER_ITEM_IN, ORDER_ITEM_INX.