Hi Marcos,
For now, I'm using the mmw_traceability.ecore "as is".
So, basically, the 3 packages useda are: mw_traceability (this has an
ElementRef), mwcore (this does not), PrimitiveTypes. The other package in
mmw_traceability is mw_base_ext. It has another ElementRef, but I don't
use it.
In my configuration, for this particular transformation, I use the EMF
model handler for my models and the AMW handler for the traceability model.
Should I check-out newer handlers? (Last time I checked out was end of
June, to the the UML Handler...).
Now, something more bizarre: sometimes it works (no 'null pointer
exception'), sometimes it doesn't. But still I'm getting this warning.
I even tried to create a new traceability model without the mw_base_ext to
see if the warning disappears, but it remains.