Physical Inventory - MI07 default reason code

Hi Friends,

I config the default for reason code to count inventory ( Movementy Type 701/702) . And I do to create the transactions for physical inventory (MI01+MI04) and then I try to post difference qty by use MI07 but a reason code disappear in reason field. Pls. help me, what should I do to set up default a reason code in that field. Thanks in advance