Hi Ahmed
you need to navigation on the left-hand panel to the decision table that you created. this is where you added your request type scenario and what you result set value will be to map into the MSMP
The screen shot you put above suggests that you did not automatically create the decision table. you are on the right track by creating the decision table to be your top expression. once you complete the information and save the decision table will be there for you to continue mapping the values.
Cheers
Colleen
