I decided to do it with some c#

//set up a web reference called MyWebService

//get the references to the site and lists from the document's data source
XPathNavigator navSiteURL =
navigator.SelectSingleNode("my:BusinessReview/my:Project/my:ProjectSite/my:ProjectSiteURL", this.NamespaceManager);
           XPathNavigator navRisksList =
navigator.SelectSingleNode("my:BusinessReview/my:Project/my:ProjectSite/my:RisksListGUID", this.NamespaceManager);
           XPathNavigator navDeliverablesList =
navigator.SelectSingleNode("my:BusinessReview/my:Project/my:ProjectSite/my:DeliverablesListGUID", this.NamespaceManager);

           MyWebService.Lists myList = new MyWebService.Lists();
           myList.Credentials =
System.Net.CredentialCache.DefaultCredentials;
           myList.Url = navSiteURL.ToString() + @"/_vti_bin/lists.asmx";
           XmlDocument doc = new XmlDocument();
           XmlElement mybatch = doc.CreateElement("Batch");

           mybatch .SetAttribute("OnError", "Continue");
           mybatch .SetAttribute("ListVersion", "1");
           mybatch .SetAttribute("ViewName", "");

           //I would replpace the title data with a reference to my
datasource
          //and I would add other list fields to be updated
           mybatch .InnerXml = "<Method ID='1' Cmd='New'>" +
              "<Field Name='ID'>New</Field>" +
              "<Field Name='Title'>a nice title for the first
item</Field></Method>";
           mybatch .InnerXml += "<Method ID='1' Cmd='New'>" +
              "<Field Name='ID'>New</Field>" +
              "<Field Name='Title'>another title for the next
item</Field></Method>";

           myList.UpdateListItems(navRisksList.ToString(), mybatch);

//do the same for the deliverables