Index: branches/RC/core/install/install_schema.sql
===================================================================
diff -u -N -r11599 -r11600
--- branches/RC/core/install/install_schema.sql	(.../install_schema.sql)	(revision 11599)
+++ branches/RC/core/install/install_schema.sql	(.../install_schema.sql)	(revision 11600)
@@ -33,6 +33,7 @@
   DisplayOrder int(11) NOT NULL default '0',
   OnGeneralTab tinyint(4) NOT NULL default '0',
   IsSystem tinyint(3) unsigned NOT NULL default '0',
+  IsRequired tinyint(3) unsigned NOT NULL default '0',
   PRIMARY KEY  (CustomFieldId),
   KEY `Type` (`Type`),
   KEY MultiLingual (MultiLingual),
Index: branches/RC/core/install/upgrades.sql
===================================================================
diff -u -N -r11599 -r11600
--- branches/RC/core/install/upgrades.sql	(.../upgrades.sql)	(revision 11599)
+++ branches/RC/core/install/upgrades.sql	(.../upgrades.sql)	(revision 11600)
@@ -1110,3 +1110,5 @@
 
 UPDATE Phrase SET Module = 'Core' WHERE Phrase IN ('la_Hide', 'la_Show', 'la_fld_Requied', 'la_col_Modified');
 ALTER TABLE Phrase ADD UNIQUE (LanguageId, Phrase);
+
+ALTER TABLE CustomField ADD IsRequired TINYINT( 3 ) UNSIGNED;
Index: branches/RC/core/units/custom_fields/custom_fields_config.php
===================================================================
diff -u -N -r11538 -r11600
--- branches/RC/core/units/custom_fields/custom_fields_config.php	(.../custom_fields_config.php)	(revision 11538)
+++ branches/RC/core/units/custom_fields/custom_fields_config.php	(.../custom_fields_config.php)	(revision 11600)
@@ -86,7 +86,9 @@
 										            'DefaultValue' => Array ('type' => 'string', 'max_len' => 255, 'not_null' => 1, 'default' => ''),
 										            'DisplayOrder' => Array('type' => 'int', 'not_null' => 1, 'default' => 0),
 										            'OnGeneralTab' => Array('type' => 'int', 'not_null' => 1, 'default' => 0),
-										            'IsSystem' => Array('type' => 'int', 'formatter' => 'kOptionsFormatter', 'options' => Array(0 => 'la_No', 1 => 'la_Yes'), 'use_phrases' => 1, 'not_null' => 1, 'default' => 0),											),
+										            'IsSystem' => Array('type' => 'int', 'formatter' => 'kOptionsFormatter', 'options' => Array(0 => 'la_No', 1 => 'la_Yes'), 'use_phrases' => 1, 'not_null' => 1, 'default' => 0),
+										            'IsRequired' => Array ('type' => 'int', 'formatter' => 'kOptionsFormatter', 'options' => Array (1 => 'la_Yes', 0 => 'la_No'), 'use_phrases' => 1, 'not_null' => 1, 'default' => 0),
+										           ),
 					'VirtualFields'	=> 	Array(
 													'Value'			=>	Array('type' => 'string', 'default' => ''),
 													'OriginalValue'	=>	Array('type' => 'string', 'default' => ''),
Index: branches/RC/core/admin_templates/custom_fields/custom_fields_edit.tpl
===================================================================
diff -u -N -r11538 -r11600
--- branches/RC/core/admin_templates/custom_fields/custom_fields_edit.tpl	(.../custom_fields_edit.tpl)	(revision 11538)
+++ branches/RC/core/admin_templates/custom_fields/custom_fields_edit.tpl	(.../custom_fields_edit.tpl)	(revision 11600)
@@ -75,6 +75,7 @@
 				<inp2:m_RenderElement name="inp_edit_box" prefix="cf" field="ValueList" title="!la_prompt_valuelist!" size="40"/>
 			</inp2:m_if>
 
+			<inp2:m_RenderElement name="inp_edit_checkbox" prefix="cf" field="IsRequired" title="la_prompt_IsRequired"/>
 			<inp2:m_RenderElement name="inp_edit_box" prefix="cf" field="DefaultValue" title="la_prompt_Default"/>
 			<inp2:m_RenderElement name="inp_edit_box" prefix="cf" field="DisplayOrder" title="!la_field_displayorder!" size="10"/>
 
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':