Please help me out

hi...

I am working on a project where i have to convert material distribution channel to customer distribution channel if both material and customer sales organization matches.If it doesn't matches the process should be followed normally.

I need to make changes in standard program or please let me know whether there is any user exits are available fore this. If i need to make change in standard where i have to do.

...please help me out soon.by tomorrow.

thanks in advance