diff --git a/booking.studygroup_leaders.inc b/booking.studygroup_leaders.inc
index 1ae27e3..db02a9f 100644
--- a/booking.studygroup_leaders.inc
+++ b/booking.studygroup_leaders.inc
@@ -372,7 +372,8 @@ function booking_studygroup_leadhelp_edit_form_submit($form, &$form_state) {
 		//iterate over the sessions for that role type
 		foreach ($values[$type] as $session_id => $person) {
 			//get the previous value
-			$previous_value = _booking_studygroup_leadhelp_edit_get_previous_value($form, $type, $session_id);
+			$previous_value = _booking_studygroup_leadhelp_edit_get_previous_value($form, $type, $type . '[' . $session_id . ']');
+			watchdog('booking_debug', "<pre>Studygroup assignment previous value:\n@info</pre>", array('@info' => print_r( $previous_value, true)));
 			//compare it against $person
 			//if $person is now empty, do a delete query
 			//if $person is now different, run an update query
@@ -383,11 +384,11 @@ function booking_studygroup_leadhelp_edit_form_submit($form, &$form_state) {
 /**
  * look through the previous form data and return the matching element
  */
-function _booking_studygroup_leadhelp_edit_get_previous_value(&$form, $type, $session_id) {
+function _booking_studygroup_leadhelp_edit_get_previous_value(&$form, $type, $name) {
 	foreach($form['form']['studygroups']['#rows'] as $key => $value) {
-		watchdog('booking_debug', "<pre>Studygroup assignment checker for type !type in session !session:\n@info</pre>", 
-			array('!session' => $session_id, '!type' => $type, '@info' => print_r( $value, true)));
-		return;		
+		//watchdog('booking_debug', "<pre>Studygroup assignment checker for type !type in session !name:\n@info</pre>", 
+		//	array('!session' => $name, '!type' => $type, '@info' => print_r( $value, true)));
+		//return;		
 		if ((!empty($value[$type]['data']['#value'])) && ($value[$type]['data']['#name'] == $name)) {
 			//found the correct element, extract the node id
 			$person = $value[$type]['data']['#value'];