RalyAPI:我如何创建一个UserStory并将其与一个功能关联起来

因此，我正在编写一个应用程序来"充实"Rally中的新客户。它将拥有创建模板的工具，这些模板将首先添加：

1. 添加"功能"
2. 在该"功能"下添加"UserStories"
3. 在这些"用户故事"下单独添加"任务"

我已经想出了第一步。但是，如何将我无法从可怕而神秘的文档中找到的任何东西联系起来。到目前为止，我拥有的是：

 var FeatureToAdd = _featureRepository.GetFeatures().FirstOrDefault(x => x.Id == 2);          
        // Initialize the REST API. You can specify a web service version if needed in the constructor.
        RallyRestApi restApi = GetRallyRestApi();
        //Create an item
        DynamicJsonObject toCreate = new DynamicJsonObject();
        toCreate["Name"] = FeatureToAdd.Name;
        toCreate["Description"] = FeatureToAdd.Description;
        // important to which this belongs, but I no ID I ever use works
        //toCreate["Workspace"] = "/workspace/" + WebConfigurationManager.AppSettings["RallyAPIWorkspaceID"];
        //toCreate["Project"] = "/project/XXXXX";
        //toCreate["Iteration"] = "/iteration/XXXXXX";
        // create feature - feature is under PortfolioItem
        CreateResult createFeatureResult = restApi.Create("PortfolioItem/Feature", toCreate);
        // scrape ID off the end of the reference
        var pureId = createFeatureResult.Reference.Substring(createFeatureResult.Reference.LastIndexOf('/') + 1);
        // add UserStories
        foreach (UserStory u in FeatureToAdd.UserStories)
        {
            toCreate = new DynamicJsonObject();
            toCreate["Name"] =u.Name;
            toCreate["Description"] = u.Description;
            toCreate["WorkProduct"] = "PortfolioItem/Feature/" + pureId;
            //toCreate["WorkProduct"] = createFeatureResult.Reference;<- tried this too
            // hierarchicalrequirement = UserStory
            CreateResult createUserStoryResult = restApi.Create("hierarchicalrequirement", toCreate);
        }

运行此操作会同时创建两者，但不会发生关联。我收到警告：

Ignored JSON element hierarchicalrequirement.WorkProduct during processing of this request.

为什么它武断地忽略了这一点？。。。

toCreate["PortfolioItem"] = Ref.GetRelativeRef(createFeatureResult.Reference);