Filter condition should apply for each context created at universe!!

HI

Scenario:

--> I have 6 fact tables,  so created six contexts.

--> All fact tables are having one dimension called -"Ref_Source"

--> We should apply filter on - "Ref_Source" field

Problem:

If I pull data from more than one fact/context [Each fact is having one context] table, the filter should apply for all the context/sql's generated.

But it's not happening in my queries.  HOw to achieve this.

Note: if i use one fact table at a time it's working fine but if i try to use multiple facts it's not working.