Detail of variable which uses rank function

When I try to make a detail of a variable which uses rank function it shows a empty column in the report with other query whereas it works fine in the report with the same query.

Variable1- [Job type ]where (Rank Job =2).

Rank Job->rank([Start Date];Top;([SSO ID]))

Start Date->Min([Assignment Effective Start Date])In([SSO Id];[Job Type]).

So Variable1 works fine when I pull it in the report of the same query.But whenI try to make a detail of it to use it in the other query report ,it shows me an empty column.

I have merged both the queries based on SSO.

Please help