diff --git a/core/class/declarationtva.class.php b/core/class/declarationtva.class.php
index 5fdfae2..08cff94 100644
--- a/core/class/declarationtva.class.php
+++ b/core/class/declarationtva.class.php
@@ -999,13 +999,26 @@ class DeclarationTVA
      */
     public function validateDeclaration($declaration_id)
     {
-        // First, try to update the declaration status
-        $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
-                SET status = 'validated', 
-                    validated_date = NOW(),
-                    validated_by = " . $this->db->escape($GLOBALS['user']->id) . "
-                WHERE rowid = " . (int)$declaration_id . " 
-                AND entity = " . $this->entity;
+        // First, check if the validated_date and validated_by columns exist
+        $sql_check_columns = "SHOW COLUMNS FROM " . MAIN_DB_PREFIX . "declarationtva_declarations LIKE 'validated_date'";
+        $result_check = $this->db->query($sql_check_columns);
+        $has_validated_columns = ($result_check && $this->db->num_rows($result_check) > 0);
+        
+        if ($has_validated_columns) {
+            // Use the enhanced version with validated_date and validated_by
+            $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
+                    SET status = 'validated', 
+                        validated_date = NOW(),
+                        validated_by = " . $this->db->escape($GLOBALS['user']->id) . "
+                    WHERE rowid = " . (int)$declaration_id . " 
+                    AND entity = " . $this->entity;
+        } else {
+            // Use the basic version without the additional columns
+            $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
+                    SET status = 'validated'
+                    WHERE rowid = " . (int)$declaration_id . " 
+                    AND entity = " . $this->entity;
+        }
         
         $result = $this->db->query($sql);
         if (!$result) {
diff --git a/run_migration.php b/run_migration.php
new file mode 100644
index 0000000..40c7c3b
--- /dev/null
+++ b/run_migration.php
@@ -0,0 +1,66 @@
+<?php
+/**
+ * Run database migration for DeclarationTVA module
+ * This script creates the necessary tables for the validation system
+ */
+
+// Load Dolibarr environment
+if (file_exists('../main.inc.php')) {
+    $res = @include '../main.inc.php';
+} elseif (file_exists('../../main.inc.php')) {
+    $res = @include '../../main.inc.php';
+} else {
+    die("Include of main fails");
+}
+
+if (!$res) {
+    die("Include of main fails");
+}
+
+// Load language files
+$langs->load("declarationtva@declarationtva");
+
+echo "<h2>DeclarationTVA Database Migration</h2>";
+
+// Read the migration SQL file
+$migration_file = __DIR__ . '/sql/migration_add_documents_table.sql';
+if (!file_exists($migration_file)) {
+    die("Migration file not found: " . $migration_file);
+}
+
+$sql_content = file_get_contents($migration_file);
+$sql_statements = explode(';', $sql_content);
+
+$success_count = 0;
+$error_count = 0;
+
+foreach ($sql_statements as $sql) {
+    $sql = trim($sql);
+    if (empty($sql) || strpos($sql, '--') === 0) {
+        continue;
+    }
+    
+    echo "<p>Executing: " . htmlspecialchars(substr($sql, 0, 100)) . "...</p>";
+    
+    $result = $db->query($sql);
+    if ($result) {
+        echo "<p style='color: green;'>✓ Success</p>";
+        $success_count++;
+    } else {
+        echo "<p style='color: red;'>✗ Error: " . htmlspecialchars($db->lasterror()) . "</p>";
+        $error_count++;
+    }
+}
+
+echo "<h3>Migration Summary</h3>";
+echo "<p>Successful statements: " . $success_count . "</p>";
+echo "<p>Failed statements: " . $error_count . "</p>";
+
+if ($error_count == 0) {
+    echo "<p style='color: green; font-weight: bold;'>Migration completed successfully!</p>";
+} else {
+    echo "<p style='color: red; font-weight: bold;'>Migration completed with errors. Please check the error messages above.</p>";
+}
+
+echo "<p><a href='declarationtvaindex.php'>← Back to Declaration List</a></p>";
+?>
diff --git a/sql/migration_add_documents_table.sql b/sql/migration_add_documents_table.sql
index 504ecb1..f27c701 100644
--- a/sql/migration_add_documents_table.sql
+++ b/sql/migration_add_documents_table.sql
@@ -16,11 +16,53 @@ CREATE TABLE IF NOT EXISTS `llx_declarationtva_documents` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 -- Add validated_date and validated_by columns to declarations table if they don't exist
-ALTER TABLE `llx_declarationtva_declarations` 
-ADD COLUMN IF NOT EXISTS `validated_date` datetime DEFAULT NULL,
-ADD COLUMN IF NOT EXISTS `validated_by` int(11) DEFAULT NULL;
+-- Check if validated_date column exists first
+SET @sql = (SELECT IF(
+    (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS 
+     WHERE TABLE_SCHEMA = DATABASE() 
+     AND TABLE_NAME = 'llx_declarationtva_declarations' 
+     AND COLUMN_NAME = 'validated_date') = 0,
+    'ALTER TABLE `llx_declarationtva_declarations` ADD COLUMN `validated_date` datetime DEFAULT NULL',
+    'SELECT "validated_date column already exists" as message'
+));
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
 
--- Add indexes for performance
-ALTER TABLE `llx_declarationtva_declarations` 
-ADD INDEX IF NOT EXISTS `idx_validated_date` (`validated_date`),
-ADD INDEX IF NOT EXISTS `idx_validated_by` (`validated_by`);
+-- Check if validated_by column exists first
+SET @sql = (SELECT IF(
+    (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS 
+     WHERE TABLE_SCHEMA = DATABASE() 
+     AND TABLE_NAME = 'llx_declarationtva_declarations' 
+     AND COLUMN_NAME = 'validated_by') = 0,
+    'ALTER TABLE `llx_declarationtva_declarations` ADD COLUMN `validated_by` int(11) DEFAULT NULL',
+    'SELECT "validated_by column already exists" as message'
+));
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- Add indexes for performance (only if they don't exist)
+SET @sql = (SELECT IF(
+    (SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS 
+     WHERE TABLE_SCHEMA = DATABASE() 
+     AND TABLE_NAME = 'llx_declarationtva_declarations' 
+     AND INDEX_NAME = 'idx_validated_date') = 0,
+    'ALTER TABLE `llx_declarationtva_declarations` ADD INDEX `idx_validated_date` (`validated_date`)',
+    'SELECT "idx_validated_date index already exists" as message'
+));
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @sql = (SELECT IF(
+    (SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS 
+     WHERE TABLE_SCHEMA = DATABASE() 
+     AND TABLE_NAME = 'llx_declarationtva_declarations' 
+     AND INDEX_NAME = 'idx_validated_by') = 0,
+    'ALTER TABLE `llx_declarationtva_declarations` ADD INDEX `idx_validated_by` (`validated_by`)',
+    'SELECT "idx_validated_by index already exists" as message'
+));
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;