fix validation issue on backend

app/Http/Requests/ExpenseRequest.php

@@ -25,7 +25,7 @@ class ExpenseRequest extends FormRequest
         return [
             'expense_date' => 'required',
             'expense_category_id' => 'required',
-            'amount' => 'required|digits_between:1,20'
+            'amount' => 'required'
         ];
     }
 }