Not success to create Sales Order Blank lines via soap web service, Items lines works fine

Hi all,

I do create Sales Order via Soap web service based on Page 42 and it's work like fine except for for Blank lines.
_blank_ type line don't raise any error message but no lines created.

Any Suggestion

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/&quot; xmlns:bec="urn:microsoft-dynamics-schemas/page/becvt">
<soapenv:Header/>
<soapenv:Body>
<bec:Create>
<bec:BECVT>
<bec:No>OrderNumber</bec:No>
<bec:Sell_to_Customer_No>CustomerID</bec:Sell_to_Customer_No>
<bec:Location_Code>LocationID</bec:Location_Code>
<bec:SalesLines>
<bec:Sales_Order_Line>
<bec:Type>_blank_</bec:Type>
<Description>TEXT COMMENTS</Description>
</bec:Sales_Order_Line>
</bec:SalesLines>
</bec:BECVT>
</bec:Create>
</soapenv:Body>
</soapenv:Envelope>