From Bug 38615: "When testing I noticed something both with and without the patch (so this is a general SIP question) If you place a hold and then try to cancel the hold with this command before checking the item into the hold shelf the SIP cancel request returns |AFError with transaction drop_hold:|" Easy to recreate with SIP emulator: 1. /kohadevbox/koha/misc/sip_cli_emulator.pl -a localhost -p 6001 -l CPL -su term1 -sp term1 -m hold --patron 23529000035676 --item 39999000001310 --hold-mode + 2. /kohadevbox/koha/misc/sip_cli_emulator.pl -a localhost -p 6001 -l CPL -su term1 -sp term1 -m hold --patron 23529000035676 --item 39999000001310 --hold-mode - 3. See the error: AFError with transaction drop_hold: