The action logging for saved reports does not pass the $original parameter to logaction(), so no structured diff is generated in the action_logs.diff column. Currently log entries store the report name and SQL concatenated as a plain string. Affected calls: - reports/guided_reports.pl MODIFY (~line 250): logaction( "REPORTS", "MODIFY", $id, "$reportname | $sql" ) (no $original; only post-change state captured as a string) - reports/guided_reports.pl ADD (~line 594): logaction( "REPORTS", "ADD", $id, "$name | $sql" ) - C4/Reports/Guided.pm DELETE (~line 798): logaction( "REPORTS", "DELETE", $id, $data->report_name . " | " . $data->savedsql ) This bug covers updating these calls to pass structured hashrefs (e.g. { report_name => ..., savedsql => ... }) as $infos and, for MODIFY, the pre-change report data as $original, enabling proper before/after diff display in the action log viewer.