It seems to me it is not possible to attach data objects to a sequence flow using an association. In fact it is allowed in BPMN 2.0
You may attach a data object's association to a sequence flow by dragging the association into the sequence flow's middle point.
You will see that a green connection point highlights so that you can drop (assign) the association in this point.
It would be great to visualize these connection points at sequence flows or at any other element so the user can find them faster, sometimes it's tricky to find them.
Has this functionality been deprecated? It doesn't appear to be possible to connect an assocation to a sequence flow as described above.
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