Definition:
The server understands the content type of the request entity and the syntax of the request entity is correct, but was unable to process the contained instructions. The client should not repeat the request without modifications
422 Unprocessable Entity - The client request was well-formed but was unable to be followed due to semantic errors
Note: For example, this error condition may occur if an XML request body contains well-formed (i.e., syntactically correct), but semantically erroneous, XML instructions.
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