diff --git a/Models/PromotionMapper.php b/Models/PromotionMapper.php
index 95f0cba..122cb93 100644
--- a/Models/PromotionMapper.php
+++ b/Models/PromotionMapper.php
@@ -32,7 +32,7 @@ final class PromotionMapper extends DataMapperAbstract
     /**
      * Columns.
      *
-     * @var array<string, array{name:string, type:string, internal:string, autocomplete?:bool, annotations?:array}>
+     * @var array<string, array{name:string, type:string, internal:string, autocomplete?:bool, readonly?:bool, annotations?:array}>
      * @since 1.0.0
      */
     protected static array $columns = [
@@ -48,7 +48,7 @@ final class PromotionMapper extends DataMapperAbstract
         'marketing_promotion_progress'      => ['name' => 'marketing_promotion_progress',      'type' => 'int',          'internal' => 'progress'],
         'marketing_promotion_progress_type' => ['name' => 'marketing_promotion_progress_type', 'type' => 'int',          'internal' => 'progressType'],
         'marketing_promotion_created_by'    => ['name' => 'marketing_promotion_created_by',    'type' => 'int',          'internal' => 'createdBy'],
-        'marketing_promotion_created_at'    => ['name' => 'marketing_promotion_created_at',    'type' => 'DateTime',     'internal' => 'createdAt'],
+        'marketing_promotion_created_at'    => ['name' => 'marketing_promotion_created_at',    'type' => 'DateTime',     'internal' => 'createdAt', 'readonly' => true],
     ];
 
     /**