I am using the decision center business console, and it allows me to create new action rules or decision tables. Also I can add new variables to the variable sets. But it seems that I cannot modify the INPUT/OUTPUT of the decision operation. I can create a new decision operation, so it seems reasonable that I should be able to add INPUT/OUTPUT variables to it... but I can't figure it out! Please help.
Open rule project map in eclipse and then Add decision operation. Here you find Signature are where you can INPUT/OUTPUT Params.