SAP C4C - Error in Hierarchical Tables

Hi

I’m trying to do a hierarchy tree view in my BO custom result list, but I have error that I can’t resolve it.

I'm doing the following steps:

1)         I create a custom BO

2)         I binding fields

3)         I create a query to search standard opportunity, and visualize it in my custom BO

4)         The execution of the query is ok but for each opportunity I have two items and these are not visualizing in my search result.

So, to resolve that, I’m trying to create the hierarchical tree view .

So I add to my DataList a Hierarchical Extension and I binding the fiels like I show in picture.

For the Hierarchical Extension “Loading” property I set “standard” value .

But this is not working and I get error when I try to load the UI view.

Could you please, somebody, to tell me what is wrong in my solution?

Thanks in advance!