/// <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));
}