-  $total += _query($query, $chart_id, $fromdate, $todate)->[0]->{sum};
+  if ($department_id) {
+    $query .= qq| AND COALESCE(
+        (SELECT department_id FROM ar WHERE ar.id=trans_id),
+        (SELECT department_id FROM gl WHERE gl.id=trans_id),
+        (SELECT department_id FROM ap WHERE ap.id=trans_id)
+    ) = ? |;
+    $total += _query($query, $chart_id, $fromdate, $todate, $department_id)->[0]->{sum};
+  } else {
+    $total += _query($query, $chart_id, $fromdate, $todate)->[0]->{sum};
+  }