[Артем Enot Грунин]

Вот нашел у себя в коде функцию:

var oTypeThis = crmForm.ObjectTypeCode;
var oTypeThisName = crmForm.ObjectTypeName;
var oTypeAssociated = Product;
var oTypeAssociatedName = "product";
var oAssociationName = "new_productsForLead";
var oAssociationRecordName = "new_productsforlead";


function getAssociatedRecordsIds()
{
    var oFetchXML =    "<fetch mapping='logical'>" +
                "<entity name='" + oAssociationRecordName + "'>" +
                    "<attribute name='" + oTypeAssociatedName + "id'/>" +
                    "<filter type='and'>" +
                        "<condition attribute='" + oTypeThisName + "id' operator='eq' value='" + crmForm.ObjectId + "'/>" +
                    "</filter>" +
                "</entity>" +
            "</fetch>";

        oFetchXML = oFetchXML.replace(/</g, '&lt;');
        oFetchXML = oFetchXML.replace(/>/g, '&gt;');

    var oSOAP =    "<?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'>" + 
                GenerateAuthenticationHeader() + 
                "<soap:Body>" + 
                    "<Fetch xmlns='http://schemas.microsoft.com/crm/2007/WebServices'>" + 
                        "<fetchXml>" +
                            oFetchXML +
                        "</fetchXml>" + 
                    "</Fetch>"+ 
                "</soap:Body>"+ 
            "</soap:Envelope>";

    var oXmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    oXmlHttp.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);
    oXmlHttp.setRequestHeader("SOAPAction","http://schemas.microsoft.com/crm/2007/WebServices/Fetch");
    oXmlHttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    oXmlHttp.setRequestHeader("Content-Length", oSOAP.length);
    oXmlHttp.send(oSOAP);

    var oResponseText = oXmlHttp.responseXML.text;

    var oXmlDoc = new ActiveXObject("Microsoft.XMLDOM");
    oXmlDoc.async = false; 
    oXmlDoc.loadXML(oResponseText);

    var results = oXmlDoc.getElementsByTagName(oTypeAssociatedName + "id");
    var associatedRecordsIds = new Array(results.length);

    for (var i = 0; i < results.length; i++)
    {
        associatedRecordsIds[i] = results[i].text;
    }
    return associatedRecordsIds;
}

Надеюсь это то что нужно. В принципе должно работать и с несистемными N:N отношениями, но возможно с рядом модификаций.