create new oOrders need DocNum

Hi,

when I create a new order using DI Server ,they always tell me need docnum ? who know why ?

thanks .

this is the XML file:

<?xml version="1.0" encoding="UTF-16" ?>

- http://schemas.xmlsoap.org/soap/envelope/">

- <env:Header>

<SessionID>32D83BB6-F3AD-985F-D4BC-655B3D9ACBE2</SessionID>

</env:Header>

- <env:Body>

- http://www.sap.com/SBO/DIS">

- <BOM>

- <BO>

- <AdmInfo>

<Object>oOrders</Object>

</AdmInfo>

- <Documents>

- <row>

<DocDate>20060101</DocDate>

<DocDueDate>20060501</DocDueDate>

<CardCode>C001</CardCode>

</row>

</Documents>

- <Document_Lines>

- <row>

<ItemCode>130200100</ItemCode>

<Quantity>1000</Quantity>

<Price>1.2</Price>

</row>

</Document_Lines>

</BO>

</BOM>

</dis:AddObject>

</env:Body>

</env:Envelope>