[Koha] Help for "Required match checks"

Hello in /koha/admin/matching-rules.pl I see 3 blocs of information. The 3rd block is "Required match checks" But I cannot find anything about it in help files, or in Koha manual. (only "'Required match checks' - ??") So, if I want to set up a matching rule, can I only fill the first two block, or also the 3rd, and if so, with what information ? Maybe the manual should be updated for that feature. Regards, M. Saby Rennes 2 University -- Mathieu Saby Service d'Informatique Documentaire Service Commun de la Documentation Université Rennes 2 Téléphone : 02 99 14 12 65 Courriel : mathieu.saby@univ-rennes2.fr