adding dimensions to a TechDraw page based on shape

[sdementen]

hello,

I have a set of <Part::PartFeature> created with Part.makeBox(...).
I have added to the document a TechDraw::DrawPage page and then a "TechDraw::DrawViewPart" view of my boxes.

I would like to add dimensions on this TechDraw::DrawPage page for some edges of some boxes (one of the top edges).

I can identify the right edges I like from the boxes (TechDraw::DrawPage) by iterating on the obj.Shape.Edges (ie, I have a list of such Edges).
How can I give the a dimension a reference to these edges ?
I have tried the following

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dim = doc.addObject("TechDraw::DrawViewDimension", "Dimension")
dim.Type = "DistanceX"
dim.References3D = [
    (doc.getObject("id_of_my_box"),"Edge10",),
]

but it complains that "Dimension has no 2D References".
If References2D is required, how can I map it from the References3D?

[edi]

A simple distance dimension in TechDraw is created using

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dim = TechDraw.makeDistanceDim(DrawViewPart,dimType,fromPoint,toPoint)

where:
DrawViewPart ... the selected View
dimType ... 'Distance','DistanceX','DistanceY'
fromPoint, toPoint ... two points

After creation you can change all properties (found in the combo-view)

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dim.X = ...x-position of the measure value
dim.LockPosition = 'True'
dim.UnderTolerance = ...
...