class A is association class of a association and class A' inherits from A. Source code seems to be OK but when I validate the model I get following error messages:

Error: Class A' contains multiple features named feature1
Error: Class A' contains multiple features named feature2

where feature1 and feature2 are the end1 and end2 role names of the association. It seems that inheritance can not be used in accociation classes in the latest ECO4 release (4.0.0.3583).

Since the existance of a linkobject is defined as being a link in an association, instances of the subclass would end up being a link in two different associations, which does not make much sense.

after a little bit thinking about the problem I've already got to the point that inheriting from a association class would not make much sense. It was only the strange error message which made me think that there could be a bug. Something like:

You can not inherit a class from a association class

would have been a bit clearer.

Peter