Rails validation errors are designed in a way that they are showed next to field in the UI interface. This does not work well for API:

Validation failed: Ip does not match selected subnet (ActiveRecord::RecordInvalid)

This error message when it's not rendered on a page but in logs or hammer/API output is missing the context and data:

• Which Subnet
• Which NIC
• What IP address

This is a generic issue, not just with NIC, therefore we need some generic solution to this problem.