> If you disagree, it should be at least push down as subclass of FAMIXNamedEntity.

Nope :). An association does not have a name usually. 
 
Stupid me, of course an association do not have a name :)

 
> What do you think?

I think the issue is relevant, but the problem is that FAMIXAssociation overrides the default source anchor. This method should go away as it is not particularly useful.

Shall I open an issues like: "remove sourceAnchor from FAMIXAssociation"?

Cheers,
Fabrizio