Dear Ujjwal,
In the context of ABAP for SAP HANA, it is recommended to use ABAP CDS views instead of HANA views (exposed as external views in the ABAP server).
You can read following document to understand better why: ABAP for HANA and "Code Push-Down"
What is meant here, is to replace the use of External views with CDS views whenever possible. To achieve this you have to re-implement your calculation. (avoid using external views...)
ABAP CDS is available since ABAP 7.4 SP05 and has been further enhanced with ABAP 7.4 SP08 and ABAP 7.5.
Various links have already been provided to you above.
Kind regards,
Carine
You can have a look at the release-specific changes