By HM Government

This form must be used to apply for an error correction review if you believe that the decision to refuse your application to become a Tier 2 or Tier 5 sponsor was as a result of a simple caseworker error, or the failure to consider a piece evidence provided at the time of the application.

Read more here:: https://www.gov.uk/government/publications/tiers-2-and-5-pre-licence-error-correction-form