odata create backnavigation does not work

Hello together,

I have some strange error when creating an item with odata and navigation - maybe anyone can help me.

I have two views.

1. Worklist.view.xml --> Display items

2. Object.view.xml --> Display Details of an item

On the Worklist.view.xml I create an item an navigate to the Object.view.xml

oDataModel.create("/LOPSet", {
			IdKunnr: lvIdKunnr
			}, {
	method: "POST",
	success: function(data) {
	var sNewId = data.Id;
	that.getRouter().navTo("object", {
objectId : sNewId
													}, true);
	},
error: function(response) {MessageToast.show("Fehler");}
});

The navigation to the object list works fine. But if I want to navigate back the worklist view I will get an error.

The Coding for navigating back is:

onPressCancel: function (oEvent) {
	var oRouter = sap.ui.core.UIComponent.getRouterFor(this);
	oRouter.navTo("worklist");
},

The error is:

Does anybody have an idea what I have to do?

The strange is. When I do the following - it works fine:

- first select an item (in edit mode)

- navigate back to the worklist

- create a new item

- navigate back to worklist => at this time it works fine

Best regards
Uwe