Index: branches/unlabeled/unlabeled-1.16.2/kernel/include/customfield.php
===================================================================
diff -u -r8305 -r8308
--- branches/unlabeled/unlabeled-1.16.2/kernel/include/customfield.php	(.../customfield.php)	(revision 8305)
+++ branches/unlabeled/unlabeled-1.16.2/kernel/include/customfield.php	(.../customfield.php)	(revision 8308)
@@ -24,7 +24,16 @@
         $a->heading = $this->Get("Heading");
         $a->prompt = $this->Get("Prompt");
         $a->ElementType = $this->Get("ElementType");
-        $a->ValidationRules="";
+    	
+    	$main_prefix = $this->getMainPrefix($this->Get('Type'));
+    	$fields = $this->Application->getUnitOption($main_prefix, 'Fields');
+    	if (isset($fields['cust'.$a->name]['required']) && $fields['cust'.$a->name]['required']) {
+    		$a->ValidationRules = 'exists';
+    	}
+    	else {
+    		$a->ValidationRules = '';
+    	}
+    	
         $a->default_value = "";
         $a->ValueList=$this->Get("ValueList");
         if(!strlen($a->ElementType))
@@ -34,6 +43,18 @@
         return $a;
       }
 
+    function getMainPrefix($item_type)
+    {
+    	static $main_prefixes = null;
+    	if (!isset($main_prefixes)) {
+    		$sql = 'SELECT Prefix, ItemType
+    				FROM '.TABLE_PREFIX.'ItemTypes';
+    		$main_prefixes = $this->Conn->GetCol($sql, 'ItemType');
+    	}
+    	
+    	return $main_prefixes[$item_type];
+    }
+    
     function parsetag($tag)
     {
          if(is_object($tag))