Problem with listing order number using PrestaShop 1.6 API Web Service

[mm_presta]

When listing orders number using https://www.xxx/api/orders/ web reference system returns xml file

<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">

<orders>

<order id="1" xlink:href="https://www.xxx/api/orders/1"/>

<order id="2" xlink:href="https://www.xxx/api/orders/2"/>

<order id="4" xlink:href="https://www.xxx/api/orders/4"/>

</orders>

</prestashop>

 

There is no reference to order_id=3.

Could someone has the same problem?