getName() method ?

Hello,
After further investigations, I made the problem a little more clear.
I manually wind up all the exports of the ‘Literal Numeric value’ class, and the problem seems to be that the package org.polarsys.capella.common.data.modellingcore.AbstractNamed Element cannot be imported on Capella Studio ( see attachment ).
I am not very accustomed to the development in Java, so i cannot really figure out whether it is a problem of configuration of my own environment or of the referencing of libraries in Capella Studio…
regards,