I am using Pega 7.2 version. I have written the activity such that while i am entering the data it is getting stored in local data source , also I am able to retrieve data using a picklist field i.e., I have given "RollNo" as a key in the local data source , I have given a connection such that using picklist the RollNo's in the local data source appears on the screen when we select the RollNo the data is getting displayed but " there is a field FirstName in the local data source and I have to use it in the correspondence rule but I am not getting the data"

Please help me to rectify this problem

Thank You

(In advance)