There may be an easier way to dynamically source your drop down list by using a Data Page (ideal) in combination with a Report Definition and or a Data Table. What is your usage scenario?

Regards,

Henry

Pega Academy

Hi Praveen, you can achieve your requirement as follows...

Data Page
--> Source: Data Transform (say: LoadInterfaceConstants)
In Data Transform, load results from Decision Tree as 
Param.returnValue = @(Pega-RULES:DecisionTable).ObtainValue(tools, Primary, "MapInterfaceConstants", false)
where MapInterfaceConstants is your Decision Table

In your Decision Table, configure the Result Actions as .Interface(<append>) [Where Interface is the pagelist].

Hope this helps !!!