Index: management/univention-web/js/widgets/_SelectMixin.js
===================================================================
diff --git a/branches/ucs-4.2/ucs-4.2-1/management/univention-web/js/widgets/_SelectMixin.js b/branches/ucs-4.2/ucs-4.2-1/management/univention-web/js/widgets/_SelectMixin.js
--- a/branches/ucs-4.2/ucs-4.2-1/management/univention-web/js/widgets/_SelectMixin.js	(Revision 82428)
+++ b/branches/ucs-4.2/ucs-4.2-1/management/univention-web/js/widgets/_SelectMixin.js	(Arbeitskopie)
@@ -89,8 +89,8 @@
 
 		value: null,
 
-		// internal variable to keep track of which ids have already been added
-		_ids: {},
+		// internal object to keep track of which ids have already been added
+		_ids: null,
 
 		_firstValueInList: null,
 
@@ -127,6 +127,7 @@
 
 		postMixInProperties: function() {
 			this.inherited(arguments);
+			this._ids = {};
 
 			this._saveInitialValue();
 
@@ -255,6 +256,7 @@
 				} )
 			} );
 			this.store.save();
+			this._ids = {};
 
 			//if (this._isAutoValue) {
 			//	// reset the _initialValue in case we chose it automatically