Given Market Identifier Codes (ISO, can be found e.g. on the ISO-website), does something exist which maps to Reuters exchange codes?

By Reuters exchange code I mean the code you e.g. send along with an equity search:

 {
      "SearchRequest":{
          "SubTypeCodes": subtype_codes,
          "AssetCategoryCodes": asset_code,
          "CurrencyCodes": crncy_codes,
          "DomicileCodes": None,
          "ExchangeCodes":exch_codes,
          "GicsCodes": None,
          "FileCodes": None,
          "Ticker": ticker,
          "IdentifierType": identifier_type,
          "Identifier": identifier,
          "PreferredIdentifierType": "Ric",
          "AssetStatus": "Active"
      }
  }

Thanks in advance