On the Sparx Systems Community Page I found an Interesting EA Addin.

It allows users to Integrate their MANTIS issue tracker with Enterprise Architect from Sparx Systems.

All Details and a Demo Video can be found on the Product Webpage:

MANEA

MANEA – Mantis Bug Tracker and Enterprise Architect integration and synchronization tool – MANEA

Maybe we should look into doing the same for Youtrack.