public async Task <ActionResult> CancelAsync(long id)
        {
            if (id <= 0)
            {
                return(this.Failed("Invalid id supplied.", HttpStatusCode.BadRequest));
            }

            var meta = await AppUsers.GetCurrentAsync().ConfigureAwait(true);

            try
            {
                await Quotations.CancelAsync(this.Tenant, id, meta).ConfigureAwait(true);

                return(this.Ok());
            }
            catch (Exception ex)
            {
                return(this.Failed(ex.Message, HttpStatusCode.InternalServerError));
            }
        }