SAPUI5 oDataModel getProperty method not working because the GUID filed

Hi,Expert:

I got a issue when I try to get the data of SAPUI5 ODataModel by getProperty method:

var myModel = this.getView().byId("UploadCollection").getModel();
			 
var itemData = myModel.getProperty("/FileSet");

it dosen't work and I debug and check the oData ,it is not only "FileSet" but "FileSet(guid'f8f21e62-b7e0-1eda-b0b7-3df17b7bf6c1')" -- the guid is added at the end.

and it should be only "FileSet",like below,only "data"

and below is the table which used to create the OData service: