UJBR - Backup/Restore from one system to another

Hello,

Using UJBR, I backed up an environment (Environment ID = XYZ) from our Development system. When I try to restore the same environment to our SandBox system, I'm getting the following error messages:

* Security data load ended in error

* Error occured while generating user security settings.

All patches/packages are equally applied in both system (Development and Sandbox), including the ones mentioned in SAP Note 1594158.

Things that I have tried:

1. Created all users (same as Development) in SandBox

2. Cleaned up all UJ* tables

3. Cleaned the environment several times.. and tried and tried again and again...

Any idea why this is happening,

Thanks,

Joel S.