Changes to List purchase orders

added the optional property allOf[subschema #1]/results/items/allOf[subschema #1]/createdBy to the response with the 200 status

added the optional property validation to the response with the 400 status

added the optional property validation to the response with the 401 status

added the optional property validation to the response with the 402 status

added the optional property validation to the response with the 403 status

added the optional property validation to the response with the 404 status

added the optional property validation to the response with the 409 status

added the optional property validation to the response with the 429 status

added the optional property validation to the response with the 500 status

added the optional property validation to the response with the 503 status

added the optional property allOf[subschema #1]/results/items/allOf[subschema #1]/lineItems/items/unitOfMeasurement to the response with the 200 status

added the non-success response with the status 402

added the non-success response with the status 403

added the non-success response with the status 429

added the non-success response with the status 500

added the non-success response with the status 503