diff --git a/app/Http/Requests/Document/DocumentItem.php b/app/Http/Requests/Document/DocumentItem.php
index 5e9cdb019..26565d3ef 100644
--- a/app/Http/Requests/Document/DocumentItem.php
+++ b/app/Http/Requests/Document/DocumentItem.php
@@ -16,7 +16,7 @@ class DocumentItem extends FormRequest
      */
     public function rules()
     {
-        if (Str::contains($item['quantity'], ['.', ','])) {
+        if (Str::contains($this->request->get('quantity'), ['.', ','])) {
             $this->quantity_size = 7;
         }