Index: kernel/utility/formatters/multilang_formatter.php
===================================================================
--- kernel/utility/formatters/multilang_formatter.php	(revision 14318)
+++ kernel/utility/formatters/multilang_formatter.php	(working copy)
@@ -172,6 +172,7 @@
 			$this->Application->setUnitOption($object->Prefix, 'CalculatedFields', $calculated_fields);
 
 			// makes original field non-required
+			unset($fields[$field_name]['required'], $object->Fields[$field_name]['required']);
 			unset($virtual_fields[$field_name]['required'], $object->VirtualFields[$field_name]['required']);
 		}