diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index 96b2fe9..5c3cc54 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -729,6 +729,7 @@ function booking_variety_regn_edit_form_submit($form, &$form_state) {
     //store the selected variety sessions in an array of IDs
     $booking_variety_ids[$id] = $selected_session_id;
   }  
+  watchdog('booking_debug', "<pre>Variety session IDs from edit form:\n@info</pre>", array('@info' => print_r( $booking_variety_ids, true)));
 
 	//if we're deleting, add the confirmation to the form if it hasn't been defined yet
   if($form_state['values']['op'] == 'Delete Session Registration' && (!isset($form_state['storage']['confirm']))) {
@@ -776,12 +777,18 @@ function booking_variety_regn_edit_form_submit($form, &$form_state) {
           ->execute();          
       }
       elseif ($booking_variety_ids[$previous_tid] != $previous_sid) {
+        watchdog('booking_debug', 'Person @nid in timeslot @tid is no longer registered for variety session @vid so reducing count by 1', array(
+          '@nid' => $values['nid'], '@tid' => $previous_tid, '@vid' => $previous_sid,
+        ));       
         // reduce regn count for old session
         db_update('booking_variety_sessions')
           ->expression('booking_variety_regncount', 'booking_variety_regncount - :count', array(':count' => 1))
           ->condition('vid', $previous_sid)
           ->execute();  
 
+        watchdog('booking_debug', 'Person @nid in timeslot @tid is now registered for variety session @vid so increasing count by 1', array(
+          '@nid' => $values['nid'], '@tid' => $previous_tid, '@vid' => $booking_variety_ids[$previous_tid],
+        ));             
         // increase regn count for new session
         db_update('booking_variety_sessions')
           ->expression('booking_variety_regncount', 'booking_variety_regncount + :count', array(':count' => 1))