Hi Nagarjuna,
Obviously, privilege SELECT on _SYS_BIC only won't allow user to delete the objects from that schema. Maybe you have MODELING role assigned to your user. If so then well.... that's a template role not meant to be used in production. Indeed this role has extreme power of _SYS_BIC but I don't see why you'd need more than SELECT and EXECUTE as _SYS_REPO owns all in there and can manage everything for you. In order words: don't use MODELING as it is... copy it and adapt to your needs
Checking the structure of db objects requires CATALOG READ or DATA ADMIN system privilege. Without that you can't get to the structure details. These are in MODELING as well....
There's a nice document out there with many granular template roles if you are building your companies HANA authorization strategy. Here it is:
BRs,
Lucas de Oliveira