SSIS:MatchUp:Matchcode
Matchcodes are sets of rules that tell MatchUp component which data fields to consider when determining if two records are duplicates. MatchUp component uses the matchcode to construct a "match key," a simplified string of characters that represents the information within the record, enough to determine if the given records is unique or a duplicate.
If you would like to copy and edit one of these default matching strategies, or create a new matchcode from scratch, select File from the menu and click Matchcode Editor.
For more information on the Matchcode Editor, see Matchcode Editor.