How to change subgrid columns by Javascript (issue with fetchXML) CRM 2013

Good morning all,

i have a problem with subgrid and fetchXML, depending of a value from a picklist in my Parent entity, I want to display different columns in a subgrid.

In order to do that, I use the fetchXML parameter. Problem is that, my columns don't change, only the filter criteria is applied.

Example : the default view contains columns : Created / Product ID Primaire / Product ID Secondaire.

I want to add  some columns : Numero de serie (serial number ) / code defaut(default code) / Sous garantie (warranty)

Syntax used is

var fetchXml = "<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>";

    fetchXml += "<entity name='hpe_ligneincident'>";


    fetchXml += "<attribute name='hpe_ligneincidentid' />";
    fetchXml += "<attribute name='hpe_quantiteprimaire' />";
    fetchXml += "<attribute name='hpe_produitprimaireid' />";
    fetchXml += "<attribute name='hpe_numerodeserie' />";
    fetchXml += "<attribute name='hpe_codedefaut' />";
    fetchXml += "<attribute name='hpe_sousgarantie' />";

    fetchXml += "<order attribute='hpe_produitprimaireid' descending='false' />";

    fetchXml += "<filter type='and'>";

    fetchXml += "<condition attribute='hpe_quantiteprimaire' operator='gt' value='3' />";
    fetchXml += "<condition attribute='hpe_incidentparentid' operator='eq' uitype='incident' value='"+ IncidentID + "' />";

    fetchXml += "</filter>";

    fetchXml += "</entity>";

    fetchXml += "</fetch>";

Problem is that, the criteria IS OK, the restriction on field hpe_quantiteprimaire is well applied BUT, the columns chosen in the attribute name tag are not displayed

what I am doing wrong ?

thank you

Thomas Larcher / HAYWARD POOL EUROPE