diff --git a/htdocs/core/lib/functions2.lib.php b/htdocs/core/lib/functions2.lib.php
index dc223f58ec3..c229a26ec3c 100644
--- a/htdocs/core/lib/functions2.lib.php
+++ b/htdocs/core/lib/functions2.lib.php
@@ -1244,6 +1244,10 @@ function check_value($mask,$value)
     if (! empty($reg[3]) && preg_match('/^@/',$reg[3]))  $maskraz=preg_replace('/^@/','',$reg[3]);
     if ($maskraz >= 0)
     {
+        if ($maskraz == 99) {
+            $maskraz = date('m');
+            $resetEveryMonth = true;
+        }
         if ($maskraz > 12) return 'ErrorBadMaskBadRazMonth';
 
         // Define reg