Project Language Level, @Override and Maven

Is someone else having the problem, that in multi-module Maven projects in IDEA, the setting "Project Language Level: 6.0 - @Override in interfaces" does not really work? It is still rendering all the implementing functions having a @Override annotation red, saying: "@Override is not allowed whne implementing interface method". The method in particular is implementing V call() throws java.lang.Exception in Callable<V>.