/// <summary> Checks if the calc factor variance is valid based on previous acceptances. </summary>
        /// <param name="context"></param>
        protected override void DoWork(CodeActivityContext context)
        {
            int    drgId = DrgId.Get(context);
            double dose  = Dose.Get(context);
            var    ext   = context.GetExtension <IOrderApprovalExtension>();

            Result.Set(context, ext.IsDoseAccepted(drgId, dose));
        }