Legenda not shallow duplicated when copy-pasting diagram

[DeBAAT]

When I copy/paste a diagram as new, I get presented a choice of three options.
The one I want is to make a shallow copy of the elements on the diagram whereby each element is a reference link to the same element defined elsewhere.
This works as expected for all elements on the diagram with the exception of legenda elements.
The legenda element is duplicated and appears as a new element in the package I paste the diagram in.
Any suggestions on how to prevent this?

[Geert Bellekens]

- Create a new (empty) diagram
- Select everything in the original diagram (Ctrl-A)
- Copy everything (Ctrl-C)
- Open the new diagram
- Paste everything (Ctrl-V)

Geert