ODATA CRUD

Hi, I am trying to implement a CUD app for a while now and have chosen to go the oDATA route

Reading data is has been an easy one

While I though create update and delete would ply the same road, I guess its another ball game,

How can you assist with

var oModel = new sap.ui.model.odata.ODataModel("http://myServer/Sentiments/services/contacts.xsodata");

  oModel.remove('/ContactsList(1)', null, function(){

  alert("Delete successful");

  },function(){

  alert("Delete failed");});

I get a failed Alert, Imagine that, What COuld i be doing wrong, permissions, security, headers...etc

This is all I have in my contacts.xsodata file service namespace "sap.hana.contact.service" { "SYSTEM"."BMBFRIENDS" as "ContactsList"; } Below is the example I want to test with as shown in the API reference

DELETE http://server/Sentiments/services/contacts.xsodata/ContactsList(1) 400 (Bad Request)d

Thanks for your help