Hello Mohit,
I guess it had something to do with the data migration during S4HANA add-on installation...would be best answered by someone from SAP who got the insight on this.
From a customer point of view I agree that a 1:1 replacement with views with the same name would have made things less complicated...especially in regards to customer development that resides directly on HANA and does not pipe through a application layer that adjusts your selections.
Regards
Florian