The action logging for acquisitions events does not pass structured data or the $original parameter to logaction(), so no structured diff is generated in the action_logs.diff column. Currently the only logged acquisitions action is: - acqui/cancelorder.pl CANCEL_ORDER (~line 82): logaction( 'ACQUISITIONS', 'CANCEL_ORDER', $ordernumber ); (no $infos or $original passed) This bug covers a broader review of acquisitions logging to: 1. Update the CANCEL_ORDER log call to pass the order data (Koha::Acquisition::Order object or its unblessed hashref) as both $infos and $original so the log shows what was cancelled. 2. Identify and add logaction() calls for other significant acquisitions events (order creation, modification, receipt) that are currently unlogged or poorly logged, passing appropriate $infos and $original data to enable diff support.