Index: branches/RC/core/units/custom_data/custom_data_event_handler.php
===================================================================
diff -u -N -r10856 -r11600
--- branches/RC/core/units/custom_data/custom_data_event_handler.php	(.../custom_data_event_handler.php)	(revision 10856)
+++ branches/RC/core/units/custom_data/custom_data_event_handler.php	(.../custom_data_event_handler.php)	(revision 11600)
@@ -112,6 +112,10 @@
 				$custom_name = $custom_params['FieldName'];
 				$field_options = Array('type' => 'string', 'not_null' => 1, 'default' => $custom_params['DefaultValue']);
 
+				if ($custom_params['IsRequired']) {
+					$field_options['required'] = 1;
+				}
+
 				switch ($custom_params['ElementType']) {
 					case 'date':
 					case 'datetime':