Changing dist. channel

Hi everyone,

i am trying to change the sales area in an order that referenced from another with different sales area.

i am somehow able to change the sales org. and the division but the distribution channel is being changed in this FV45PF0_MAAPV_SELECT last and i am not able to change it in any exit.Do you know any exit that is proven to work changing the sales area?

Thanks for any help.