Some points to check
- RPD (offline) open - Manage - Identity - No users should be listed here, if present, can delete and deploy RPD
- Check is your case similiar to How-to: Enable Case Insensitive User Name Log-in with OBIEE 11g ~ Ask John OBIEE - Oracle Business Intelligence Guides, …
thanks Naveen for reply,
The issue got resolved after disabling the unwanted security initaliztion block.