Index: branches/RC/core/kernel/db/dbitem.php
===================================================================
diff -u -r10576 -r10794
--- branches/RC/core/kernel/db/dbitem.php	(.../dbitem.php)	(revision 10576)
+++ branches/RC/core/kernel/db/dbitem.php	(.../dbitem.php)	(revision 10794)
@@ -835,14 +835,22 @@
 		$lang_count = $ml_helper->getLanguageCount();
 		foreach ($this->Fields as $field => $options)
 		{
+			// master field is set only for CURRENT language
 			if (isset($options['formatter']) && $options['formatter'] == 'kMultiLanguage' && isset($options['master_field'])) {
 				if (preg_match('/^l([0-9]+)_(.*)/', $field, $regs)) {
 					$l = $regs[1];
 					$name = $regs[2];
-					unset($options['required']); // all non-primary language field set to non-required
-					for ($i=1; $i<=$lang_count; $i++) {
+					// MuliLanguage formatter sets error_field to master_field, but in PopulateMlFields mode, we display ML fields directly
+					// so we set it back to itself, otherwise error will not be displayed
+					$this->Fields['l' . $l . '_' . $name]['error_field'] = 'l' . $l . '_' . $name;
+					for ($i = 1; $i <= $lang_count; $i++) {
 						if ($i == $l || !$ml_helper->LanguageFound($i)) continue;
-						$this->Fields['l'.$i.'_'.$name] = $options;
+						$f_options = $options;
+						$f_options['error_field'] = 'l' . $i . '_' . $name;  // set error field back to itself - see comment above
+						if ($i != $this->Application->GetDefaultLanguageId()) {
+							unset($f_options['required']); // all non-primary language field set to non-required
+						}
+						$this->Fields['l' . $i . '_' . $name] = $f_options;
 					}
 				}
 			}
Index: branches/RC/core/kernel/utility/formatters/multilang_formatter.php
===================================================================
diff -u -r9227 -r10794
--- branches/RC/core/kernel/utility/formatters/multilang_formatter.php	(.../multilang_formatter.php)	(revision 9227)
+++ branches/RC/core/kernel/utility/formatters/multilang_formatter.php	(.../multilang_formatter.php)	(revision 10794)
@@ -89,12 +89,39 @@
 	{
 
 	}
+	*/
 
+	/**
+	 * Checks, that field value on primary language is set
+	 *
+	 * @param string $field
+	 * @param mixed $value
+	 * @param Array $options
+	 * @param kDBItem $object
+	 */
 	function UpdateMasterFields($field, $value, &$options, &$object)
 	{
+		$master_field = array_key_exists('master_field', $options) ? $options['master_field'] : false;
+		if (!$master_field) {
+			return ;
+		}
 
-	}*/
+		// moved here from Parse, because at Parse time not all of the fields may be set - this is extremly actual, when working with PopulateMlFields mode
+		$lang = $this->Application->GetVar('m_lang');
+		$def_lang = $this->Application->GetDefaultLanguageId();
 
+		if (!$this->Application->GetVar('allow_translation') && ($lang != $def_lang) && getArrayValue($options, 'required')) {
+			$def_lang_field = 'l' . $def_lang . '_' . $master_field;
+			if ( !$object->ValidateRequired($def_lang_field, $options) ) {
+				$object->SetError($master_field, 'primary_lang_required');
+
+				if (array_key_exists($def_lang_field, $object->Fields)) {
+					$object->SetError($def_lang_field, 'primary_lang_required');
+				}
+			}
+		}
+	}
+
 	function Format($value, $field_name, &$object, $format=null)
 	{
 		$master_field = isset($object->Fields[$field_name]['master_field']) ? $object->Fields[$field_name]['master_field'] : false;
@@ -124,18 +151,8 @@
 	 */
 	function Parse($value, $field_name, &$object)
 	{
-		$lang = $this->Application->GetVar('m_lang');
-		$def_lang = $this->Application->GetDefaultLanguageId();
-		$master_field = getArrayValue($object->Fields, $field_name, 'master_field');
-
-		if (!$this->Application->GetVar('allow_translation') && $lang != $def_lang && getArrayValue($object->Fields, $field_name, 'required')) {
-			$def_lang_field = 'l'.$def_lang.'_'.$master_field;
-			if ( !$object->ValidateRequired($def_lang_field, $object->Fields[$field_name]) ) {
-				$object->SetError($master_field, 'primary_lang_required');
-			}
-		}
-
 		if ($value == '') return NULL;
+
 		return $value;
 	}
 }
\ No newline at end of file