Unprocessable Entity

Indicates that the server understands the content type of the request entity, and the syntax of the request entity is correct, but it was unable to process the contained instructions.

Important: The client should not repeat this request without modification.

Common Causes

• The request is syntactically valid but violates business rules.
• A state transition is not allowed for the current resource status.
• Referenced resources exist but are incompatible (for example, currency mismatch).