Epidosis added a comment.
I think it should be prevented in any case. More precisely, I think we should prevent adding exactly equal references and also adding references which present the same parts in a different order, and afterwards we should send a cleaning-bot. I add an example: 1. I added one reference 2. then I added the same reference, only changing the order of its parts: it worked (https://www.wikidata.org/w/index.php?title=Q369129&diff=1320370815&oldid=1320370672) 3. then I added the same reference, exactly equal to its first configuration: it worked (https://www.wikidata.org/w/index.php?title=Q369129&diff=1320370908&oldid=1320370815) Both the second and the third case should not work. TASK DETAIL https://phabricator.wikimedia.org/T224333 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Epidosis Cc: Epidosis, Lydia_Pintscher, matej_suchanek, Aklapper, Akuckartz, Nandana, lucamauri, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Wikidata-bugs, aude, Mbch331
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