diff --git a/admin/setup_mvp.php b/admin/setup_mvp.php
index 2b6cfb6..0ad1d19 100644
--- a/admin/setup_mvp.php
+++ b/admin/setup_mvp.php
@@ -94,6 +94,11 @@ if ($action == 'update_vat_refund_threshold') {
         'refund_threshold_enabled' => GETPOST('vat_refund_threshold_enabled', 'int')
     );
     
+    // Debug: Log the received values
+    error_log("VAT Refund Threshold Debug - Received values:");
+    error_log("refund_threshold: " . $threshold_config['refund_threshold']);
+    error_log("refund_threshold_enabled: " . $threshold_config['refund_threshold_enabled']);
+    
     $updated = $config->updateVATRefundThresholdConfiguration($threshold_config);
     if ($updated) {
         setEventMessages($langs->trans("VATRefundThresholdConfigurationUpdated"), null, 'mesgs');
diff --git a/core/class/declarationtva_config.class.php b/core/class/declarationtva_config.class.php
index 25eabc4..2fabe45 100644
--- a/core/class/declarationtva_config.class.php
+++ b/core/class/declarationtva_config.class.php
@@ -760,7 +760,13 @@ class DeclarationTVA_Config
     public function updateVATRefundThresholdConfiguration($threshold_config)
     {
         foreach ($threshold_config as $key => $value) {
-            $this->set('vat_refund_' . $key, $value);
+            $config_key = 'vat_refund_' . $key;
+            error_log("Saving VAT refund threshold config: " . $config_key . " = " . $value);
+            $result = $this->set($config_key, $value);
+            if (!$result) {
+                error_log("Failed to save VAT refund threshold config: " . $config_key . " = " . $value);
+                return false;
+            }
         }
         return true;
     }