MASS Update of Sales Orders

Hi All,

I am trying to Update some of the Sales Orders with Reason for Rejection and also new quantity. I am trying to do the same using MASS transaction, it is working fine for Reason for Rejection but I am not able to specify the Quantity, because there is no option to give Quantity for the sales order. Is it actually possible to update the quantity of the sales orders using MASS transaction? Please guide me if there is any other way to update the sales orders with new quantity.

Helpful answers are rewarded.

Thanks,

Shashi.