diff --git a/admin/reports.inc.php b/admin/reports.inc.php
index fae5e40..0a5e429 100644
--- a/admin/reports.inc.php
+++ b/admin/reports.inc.php
@@ -730,9 +730,16 @@ foreach($report_stock as $n=>$v) {
 			/* See if any of the "group" fields have changed */
 			foreach($report['group'] as $x=>$g) {
 				$c = $fieldname[$g['field']];				
-				if($last_group_data[$c] != $i[$c])
+
+				if($fields[$g['field']]['exec_function'])
+					$i_c=call_user_func_array($fields[$g['field']]['exec_function'], array($report,$f,$i[$c]));
+				else
+					$i_c=$i[$c];
+
+				if($last_group_data[$c] != $i_c)
 					$group_change = true;
-				$last_group_data[$c] = $i[$c];
+
+				$last_group_data[$c] = $i_c;
 			}
 
 			if($group_change) {