order reason for credit meo

Hi All,

I have a scenario in which particular Condition type should be used for particular reason code e.g.

C-type ZACV (Unsold return) Reason code (999 for unsold return).

When above mentioned condition type is using in document then only above mentioned Reason code is acceptable. Apart from this user is not allowed to maintain any other reason code.If user maintain system should throw an error.

Can any body provide user exit with logic for the same?

Regrds

San

Edited by: SAN_SD on Nov 10, 2008 11:25 AM