Hi ,
You are binding title="{Kostl}" and description="{Ktext}" in Dialog and your filter path is "Saknr". Change it to "Kostl" or "Ktext".
If you want to filter on both then you can use something like this :
var sValue = evt.getParameter("value");
var oFilterName = new sap.ui.model.Filter("Kostl", sap.ui.model.FilterOperator
.Contains, sValue);
var oFilterCode = new sap.ui.model.Filter("Ktext", sap.ui.model.FilterOperator
.Contains, sValue);
var oFilter = new sap.ui.model.Filter({filters : [oFilterName, oFilterCode], and : false});
evt.getSource().getBinding("items").filter([oFilter]);
I hope it helps .
Regards
Mayank Jain