Currently real back-end errors are not getting propagated correctly.
I've fixed all the components and exception classes accordingly from a series of commits starting from aa911d490ec9e4bff2a7f0a16667a320c22b39e0
stratos> deploy-partition --resource-path /stratos/partition.json
Exception [errorCode= 400, errorMessage= Invalid Partition Detected : P1. Cause: Invalid region: ap-southeast-0 in the iaas: ec2]
This can be seen in the exceptions again.
This is a different issue. Created STRATOS-1386