How to validate scope type with category

hello all.

WE have requirement to validate category and scope type :

for example if user selects category as enhancement and if scope type is SMAD Then raise error message and the document not to be saved.

how ow we can achieve same..

any custom code to written in bps class implemendation...?

appreciate your help

thanks

mahesh

Message was edited by: Mahesh Garud