Webi ..SQL Error with odd "WHERE" clause with empty "AND ( )" conditions

I am facing a issue with Webi Reports SQL. 

While using few specific objects from a particular class, it is generating SQL with odd "WHERE" clause with empty "AND ( )" conditions. 

At universe these object have aggregate_aware applied with proper aggregate  Navigation, and the SQL does not contain  "WHERE" clause with empty "AND ( )" for these objects.   

Facing the same issue in Webi 4.x and XIR3 as well, and to more of my surprise this issues doesn't exist in Deski Report.

I am clue less please help me...

Thanks in advance, 

Sujit