Hi Ankeet,
After a long analysis with SAP its found that the issues is with the user privileges.
Actually the schema tables were created with a user id and during server migration the schema got transferred to DBA user id, hence the current ownership of the schema lied on DBA user id.
Hence the original user id is no more valid to create or unarchive repositories. From DBA user id we were able to unarchive and create repositories.
We have not yet taken decision wether to continue with DBA user id or to migrate the schema from DBA to the regular id.
Thanks for all the inputs.
Regards,
Giridharan