diff --git a/core/class/declarationtva_config.class.php b/core/class/declarationtva_config.class.php
index a8426c8..b45a400 100644
--- a/core/class/declarationtva_config.class.php
+++ b/core/class/declarationtva_config.class.php
@@ -116,8 +116,8 @@ class DeclarationTVA_Config
         if (!empty($account_codes)) {
             foreach ($account_codes as $account_code) {
                 if (!empty($account_code)) {
-                    // Check if mapping already exists
-                    $check_sql = "SELECT id FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
+                    // Check if mapping already exists (active or inactive)
+                    $check_sql = "SELECT rowid, is_active FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                                  WHERE entity = " . $this->entity . " 
                                  AND ca3_line = '" . $this->db->escape($ca3_line) . "' 
                                  AND account_code = '" . $this->db->escape($account_code) . "'";
@@ -125,7 +125,7 @@ class DeclarationTVA_Config
                     error_log("DeclarationTVA: Check query result: " . ($check_result ? 'SUCCESS' : 'FAILED - ' . $this->db->lasterror()));
                     
                     if ($check_result && $this->db->num_rows($check_result) > 0) {
-                        // Update existing mapping
+                        // Update existing mapping (reactivate it)
                         $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                                 SET is_active = 1 
                                 WHERE entity = " . $this->entity . "