Best way to update a table

Hi,

I was wondering which is the best way to update a table.

I tried with the folowwing code:

		var oFilter2 = new sap.ui.model.Filter("username", sap.ui.model.FilterOperator.EQ, sap.ui.getCore().getControl("txt_username").getValue());
		var oFilter3 = new sap.ui.model.Filter("cost_from", sap.ui.model.FilterOperator.EQ, c_f);
		var oFilter4 = new sap.ui.model.Filter("cost_to", sap.ui.model.FilterOperator.EQ, c_t);
		var oFilter5 = new sap.ui.model.Filter("date_from", sap.ui.model.FilterOperator.EQ, d_f);
		var oFilter6 = new sap.ui.model.Filter("date_to", sap.ui.model.FilterOperator.EQ, d_t);
		var oFilter7 = new sap.ui.model.Filter("cost_type", sap.ui.model.FilterOperator.EQ, t);
		var oFilter8 = new sap.ui.model.Filter("approval", sap.ui.model.FilterOperator.EQ, a);

			var sURI2 = "http://sapecc.system.loc/sap/opu/odata/sap/ZWUYTSR_CM_EXPENSES_SEARCH/";
			var oModel2 = new sap.ui.model.odata.ODataModel(sURI2, false, "username", "password");
			oTable2.setModel(oModel2);
			oTable2.bindRows("/zwuytsr_expenses_searchCollection", null, null, [oFilter2, oFilter3, oFilter4, oFilter5, oFilter6, oFilter7, oFilter8]);

When one of the search parameters changes I use this code to change refresh my model:

var type = new sap.ui.commons.DropdownBox({change : function(){

t = this.getValue();

console.log(t);

oFilter7 = new sap.ui.model.Filter("cost_type", sap.ui.model.FilterOperator.EQ, t);

oModel2.updateBindings({

bForceUpdate: true

});

oModel2.refresh();

}});

It seems like the filter doesn't change, because in the ABAP debugger the value always stays the same, in this case cost_type = 'ANY'.

Anyone who can tell me what I'm doing wrong?

Thanks!