Как создать экземпляр кастомной сущности через SOAP?

[Tony Green]

Мой код запроса:

            var xml = "<?xml version='1.0' encoding='utf-8'?>"+ 
            "<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'"+
            " xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'"+
            " xmlns:xsd='http://www.w3.org/2001/XMLSchema'>"+ 
            "<soap:Header>"+
            "<CrmAuthenticationToken xmlns='http://schemas.microsoft.com/crm/2007/WebServices'>"+
            "<AuthenticationType xmlns='http://schemas.microsoft.com/crm/2007/CoreTypes'>"+'0'+"</AuthenticationType>"+
            "<OrganizationName xmlns='http://schemas.microsoft.com/crm/2007/CoreTypes'>"+'orgdev'+"</OrganizationName>"+
            "<CallerId xmlns='http://schemas.microsoft.com/crm/2007/CoreTypes'>"+'7B9BEB07-B1C6-DD11-8BD2-0016E6634005'+"</CallerId>"+
            "</CrmAuthenticationToken>"+
            "</soap:Header>"+
            "<soap:Body>"+ 
            "<Create xmlns='http://schemas.microsoft.com/crm/2007/WebServices'>"+ 
            "<entity xsi:type='new_paymentorder'>"+ 
            "<new_name>"+'test'+"</new_name>"+ 
            "<new_legalpayerid>"+'41EF1687-BFD5-DD11-9D4D-0016E6634005'+"</new_legalpayerid>"+ 
            "<new_currencyid>"+'B8DDE840-B1C6-DD11-8BD2-0016E6634005'+"</new_currencyid>"+
            "<new_paymtype>"+'1'+"</new_paymtype>"+
            "</entity>"+ 
            "</Create>"+ 
            "</soap:Body>"+ 
            "</soap:Envelope>";

ошибка вот такая: soap:ServerServer was unable to process request. 0x80040203 entity Platform

Утилиту посмотрел - она как-то не шибко хочет работать с DynamicEntity, на которых я бы написал этот запрос в C#...