diff --git a/core/dbobjectsearch.class.php b/core/dbobjectsearch.class.php
index 62cb6d8d4..abf4ae396 100644
--- a/core/dbobjectsearch.class.php
+++ b/core/dbobjectsearch.class.php
@@ -921,6 +921,7 @@ class DBObjectSearch
 			{
 				$aParams = array_merge($aContextParams, $this->m_aParams);
 			}
+			$aParams = MetaModel::PrepareQueryArguments($aParams);
 		}
 		else
 		{
@@ -1287,4 +1288,4 @@ class DBObjectSearch
 }
 
 
-?>
+?>
diff --git a/core/metamodel.class.php b/core/metamodel.class.php
index 1e5398a05..ef245bf92 100644
--- a/core/metamodel.class.php
+++ b/core/metamodel.class.php
@@ -1976,7 +1976,7 @@ abstract class MetaModel
 
 	protected static $m_aQueryStructCache = array();
 
-	protected static function PrepareQueryArguments($aArgs)
+	public static function PrepareQueryArguments($aArgs)
 	{
 		// Translate any object into scalars
 		//
@@ -4994,4 +4994,4 @@ MetaModel::RegisterZList("preview", array("description"=>"All attributes visible
 MetaModel::RegisterZList("standard_search", array("description"=>"List of criteria for the standard search", "type"=>"filters"));
 MetaModel::RegisterZList("advanced_search", array("description"=>"List of criteria for the advanced search", "type"=>"filters"));
 
-?>
\ No newline at end of file
+?>