Hi Amol,
so, ADBC is available in your system, but you have to make sure that the correct DBSL library for HANA (HDB) is available in your system. You can then just check if you can correctly communicate with the report ADBC_TEST_CONNECTION (using the secondary connection maintained in table DBCON) to your HANA database.
You may have a look at the example on how to select from an external view in report ADBC_QUERY (which selects from a DB table), by using a secondary DB connection to your HANA DB and using the HANA view instead of a DDIC table.
Of course in ADBC you have to take care about the correct type mapping (as you cannot use a DDIC type for definition of your internal table into which you select).
Best,
Jasmin
BTW: One word of precaution, the tasks you try to accomplish is rather cumbersome. We definitively recommend to use a more recent release (e.g. NetWeaver 7.4 SP5 or beyond), however, I think that's not your decision, right?