Index: core/admin_templates/js/ajax_dropdown.js
===================================================================
--- core/admin_templates/js/ajax_dropdown.js
+++ core/admin_templates/js/ajax_dropdown.js
@@ -126,13 +126,6 @@
 
 	$(this.Input)
 	.attr('autocomplete', 'off')
-	.keydown (
-		function($e) {
-			if ($e.keyCode == 13) {
-				return false;
-			}
-		}
-	)
 	.keyup ( function(ev) { obj.KeyUp(ev) } )
 	.blur ( function(ev) { obj.Blur(ev) } );