Hello, i get the follwing Error when i try to Update Itms with UpdateListItems on an SharePoint Online. My i user a List in a subweb, so i use the subweb url for the Reference <Results xmlns="http://schemas.microsoft.com/sharepoint/soap/"><Result ID="1,Update"><ErrorCode>0x81020026</ErrorCode><ErrorText>Es wird auf eine Liste verwiesen, welche nicht mehr vorhanden ist.</ErrorText></Result></Results> The Code: .... // Verbindung zur SharePoint Online Liste SourceListRef.Lists SourceList = new SourceListRef.Lists(); System.Net.NetworkCredential SourceListCred = new System.Net.NetworkCredential(); SourceListCred.UserName = "XXX"; SourceListCred.Password = "XX"; SourceList.Credentials = SourceListCred; String camlQuery = "<Where><Contains>" + "<FieldRef Name='abgleich'/>" + "<Value Type='Integer'>0</Value>" + "</Contains></Where>"; //SharePoint Online Liste auslesen XmlDocument xmlDocSourceList = new XmlDocument(); XmlElement query = xmlDocSourceList.CreateElement("Query"); query.InnerXml = camlQuery; XmlNode queryResult = SourceList.GetListItems("EF56BA6D-E531-4117-A0B7-5D43792C1AA9", null, query, null, null, null, null); XmlNodeReader r = new XmlNodeReader(queryResult); Console.WriteLine(queryResult.OuterXml); //Console.WriteLine(queryResultDest.OuterXml); string strQuery; XmlDocument xmlDoc = new System.Xml.XmlDocument(); System.Xml.XmlElement elBatch = xmlDoc.CreateElement("Batch"); elBatch.SetAttribute("OnError", "Continue"); elBatch.SetAttribute("ListVersion", "1"); while (r.ReadToFollowing("z:row")) { strQuery = "<Method ID='1' Cmd='Update'>" + "<Field Name='ows_ID'>" + r["ows_ID"] + "</Field>" + "<Field Name='ows_Titel'>BlUBB</Field>" + "<Field Name='ows_abgleich'>1</Field></Method>"; elBatch.InnerXml = strQuery; XmlNode ndReturn = SourceList.UpdateListItems("EF56BA6D-E531-4117-A0B7-5D43792C1AA9", elBatch); Console.WriteLine(ndReturn.OuterXml.ToString()); // Return ausgabe } Console.WriteLine("Press any key to continue..."); Console.Read();