InfoPath Dev

Hi,

What I try to make is a selectsinglenode with a condition in a secondary datasource.

Hier is my code:

[InfoPathEventHandler(MatchPath="/AV/AVel/M/choix", EventType=InfoPathEventType.OnAfterChange)]
public void choix_OnAfterChange(DataDOMEvent e)
{
	//sélection du muster pour le remplissage
	if (e.IsUndoRedo)
	{
	return;}
	if (e.Source.nodeType != DOMNodeType.NODE_TEXT)
	{
	return;}
	if(e.Site != e.Parent)
	{
	return;}
        if ("Insert" != e.Operation)
        {
          return;}
//Sélection du noeud a remplacer et récup de l'id 
IXMLDOMNode Old = e.Source.parentNode.parentNode.selectSingleNode("Muster");

string Choicetext = e.Source.text;
string condition = "/dfs:myFields/dfs:dataFields/tns:getMusterParamsResponse/tns:getMusterParamsResult/tabMuster/Modele[Des = '" + Choicetext + "']/Muster";

//Recherche du bon modele a l'aide de l'id		
IXMLDOMDocument2 oDomSearch = (IXMLDOMDocument2)thisXDocument.GetDOM("getMusterParams");
oDomSearch.setProperty("SelectionNamespaces", "xmlns:xhtml=\"http://www.w3.org/1999/xhtml\"
xmlns:dfs=\"http://schemas.microsoft.com/office/infopath/2003/dataFormSolution\" xmlns:tns=\"http://zefix.powernet.ch/WebServices\"");

IXMLDOMNode New = oDomSearch.selectSingleNode(condition);

Choice is a dropdown listebox populate by the same datasource so infopath must find this entry!

The problem is that this listebox is in a repeating section and if it's not the first occurence(if first occurence that always work) that dont work anymore: new is null (for all entry)!

my XPath (string condition) for example is: "/dfs:myFields/dfs:dataFields/tns:getMusterParamsResponse/tns:getMusterParamsResult/tabMuster/Modele[Des = 'Bes. befähigter Revisor, Hinterlegung Unterlagen']/Muster" and that send null (I have seen in the secondary ds he is present)

Any idea about what is going wrong?

I'm totally lost!

Thierry