Hi Mohan,
In addition to the select privileges on _SYS_REPO user, can you check if you have following authorizations to the user at package level too
Developers should be granted the following privileges for native packages:●
REPO.READ This privilege authorizes read access to packages and design-time objects, including both native and imported objects.●
REPO.EDIT_NATIVE_OBJECTS This privilege authorizes all kinds of inactive changes to design-time objects in native packages.●
REPO.ACTIVATE_NATIVE_OBJECTS This privilege authorizes the user to activate or reactivate design-time objects in native packages.●
REPO.MAINTAIN_NATIVE_PACKAGES This privilege authorizes the user to update or delete native packages, or create sub-packages of native packages.
Source(SAP HANA security guide )
Hope that helps you. Thanks!
Regards
Abhinav