WebApi OData Delete routing convention

I have a MVVM project. For the model I use a EF6.0.0 code first and WebApi.

In general everything works fine but for one thing.

When I do a delete the following URL is composed

http://localhost:50346/Recruiters/Addresses(guid'5d778c9d-56b2-449b-b655-22489e01636d')/CIP.Models.Domain.Addresses

and this results in a 404 error.

So I've created an routing convention like this:

using Microsoft.Data.Edm; 
using System; 
using System.Collections.Generic; 
using System.Diagnostics.Contracts; 
using System.Linq; 
using System.Net.Http; 
using System.Web; 
using System.Web.Http.Controllers; 
using System.Web.Http.OData.Routing; 
using System.Web.Http.OData.Routing.Conventions;  

namespace CIP 
{ 
   public class AddressesRoutingConvention : EntitySetRoutingConvention 
   { 
      public override string SelectAction(ODataPath odataPath, HttpControllerContext controllerContext, ILookup actionMap) 
      { 
         if (odataPath.PathTemplate == "~/entityset/key/cast") 
         {
            HttpMethod httpMethod = controllerContext.Request.Method; 
            string httpMethodName; 
            switch (httpMethod.ToString().ToUpperInvariant()) 
            { 
                 case "DELETE":
                   httpMethodName = "Delete"; 
                   break; 
                 default: 
                     return null;
             } 

            Contract.Assert(httpMethodName != null); 
            IEdmEntityType entityType = odataPath.EdmType as IEdmEntityType; 

            string actionName = httpMethodName + entityType.Name; 

            if (actionName != null) 
            {
                KeyValuePathSegment keyValueSegment = odataPath.Segments[1] as KeyValuePathSegment;
                controllerContext.RouteData.Values[ODataRouteConstants.Key] = keyValueSegment.Value; 

               return actionName; 
            } 
         } // Not a match return null; 
      }
    }
 }

and added this route

   var conventions = ODataRoutingConventions.CreateDefault();
   conventions.Insert(0, new AddressesRoutingConvention());  
   config.Routes.MapODataRoute("Addresses", "Addresses", addressesBuilder.GetEdmModel(), new DefaultODataPathHandler(), conventions);`

And in the controller

   public async Task DeleteAddresses([FromODataUri] Guid key)
    {
       Addresses addresses = await db.Addresses.FindAsync(key); 

      if (addresses == null)
       {
          return NotFound();
       }      
      db.Addresses.Remove(addresses);
      await db.SaveChangesAsync();
       return StatusCode(HttpStatusCode.NoContent); 
      }

But still I get the 404 error.

I tried testing it from SOAPUI with the same result.

Am I missing something?

Kind regards

Jeroen