Getting PB hanged(Not Responding) status while creating DW object using SQL Select

I am creating DW using SQL Select, when I select SQL Select data source and click on Next in DW painter my PB got hanged(Not Responding) status.

Also getting same probelm when creating DW through Stored Procedure.

I am having 1500 tables in my database.

Please help me...

Thanks ,

Pralhad.