diff --git a/src/Util/XML.php b/src/Util/XML.php
index 1af9903b3..7fff7ed24 100644
--- a/src/Util/XML.php
+++ b/src/Util/XML.php
@@ -42,6 +42,8 @@ class XML
     /**
      * Removes the PKCS#7 header and the signature info footer from a digitally-signed .xml.p7m file using CAdES format.
      *
+     * TODO: controllare il funzionamento con gli allegati.
+     *
      * @param string $string File content
      * @return string An arguably-valid XML string with the .p7m header and footer stripped away.
      *
diff --git a/src/Validate.php b/src/Validate.php
index 33f4ad5e8..6a4e80155 100644
--- a/src/Validate.php
+++ b/src/Validate.php
@@ -11,7 +11,7 @@ use Respect\Validation\Validator as v;
  */
 class Validate
 {
-    public static function VatCheck($partita_iva)
+    public static function vatCheck($partita_iva)
     {
         if ($partita_iva === '') {
             return true;
@@ -54,6 +54,11 @@ class Validate
             return true;
         }
 
+        // Controllo sulla sintassi
+        if (!static::vatCheck($vat_number)) {
+            return false;
+        }
+
         // Controllo con API europea ufficiale
         if (extension_loaded('soap')) {
             try {