@Nour Khaled You should first check what is calling the rest API and whether it’s sending the request twice by reviewing the logs. If the duplicate calls are coming from the source system, you may need to adjust how it’s triggering the request. Additionally, you can implement a validation step before posting the sales order in NetSuite. For example, check if a record with the same sales order number already exists, and if it does, return a message like “Sales order already exists” to prevent duplication.