diff --git a/app/Http/Requests/Setting/Category.php b/app/Http/Requests/Setting/Category.php
index cb7c7c89c..758c6557a 100644
--- a/app/Http/Requests/Setting/Category.php
+++ b/app/Http/Requests/Setting/Category.php
@@ -3,9 +3,11 @@
 namespace App\Http\Requests\Setting;
 
 use App\Abstracts\Http\FormRequest;
+use App\Traits\Modules;
 
 class Category extends FormRequest
 {
+    use Modules;
     /**
      * Get the validation rules that apply to the request.
      *
@@ -15,8 +17,11 @@ class Category extends FormRequest
     {
         $types = collect(config('type.category'))->keys();
 
+        $code = $this->moduleIsEnabled('double-entry') ? 'required|string' : 'nullable|string';
+
         return [
             'name' => 'required|string',
+            'code' => $code,
             'type' => 'required|string|in:' . $types->implode(','),
             'color' => 'required|string|colour',
         ];