Hi Ferry,
What we generally do is - On click of some item in Master page we load the Detail page. But since the page gets loaded very first time, from next time onwards, we just navigate there. So the new data does not get updated. One of the way to get rid of this is -
while initializing the Details page, have this code
if (sap.ui.getCore().byId("idOfDetailPage") !=null) {
sap.ui.getCore().byId("idOfDetailPage") .destroy();
}
//Then initialize your page
-Regards
Dhrubajyoti