https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16534 --- Comment #8 from Theodoros Theodoropoulos <theod@lib.auth.gr> --- I've tested changing sysprefs in my v3.22.06.005 sandbox and it seems that one of the following parameters is related to the error! AutomaticItemReturn: Don't UseBranchTransferLimits: Enforce library transfer limits based on Item type IndependentBranches: Don't prevent AllowReturnToBranch: Allow materials to be returned to only the library the item is from AutomaticItemReturn: Don't automatically transfer items to their home library when they are returned. @Jonathan, can you please set them in your test installation and verify if you get the duplicate key error? ...we're getting close... -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.