Composite provider with calculation view---Create Assigment not working

Hi Experts,

I am facing issue while adding columns from Source to Target in Composite provider. Composite provider is based on Calculation view. We have added 2 new fields in the semantic of Calculation view and those fields need to be added in the composite provider but unable to add the fields as "Create Assignment" option is disabled. I tried dragging to the target but it is not working.

issue.png

Any advice?

Thanks

Akshay