Start with a claim sheet. Record the exact advertising sentence, medium, publication date, service concerned and intended period. Add the question which concrete fact a guest is meant to take from the statement. This makes it possible to choose evidence that actually answers the claim.
For energy or emissions statements, invoices, readings, supplier records, calculation bases and the covered period may be important. For regional or organic offers, origin, delivery scope, product designation and the part of the food service advertised should be traceable. The record must fit the wording and must not suggest wider performance than it proves.
Keep the version of the records that applied when the advertising was published. Add the responsible person, review method and update date. If a supplier, energy source, certificate or operating process changes, the advertising needs a fresh check. An old record may no longer support a current claim.