This may be a duplicate of
in which case I apologise.
I'm finding that sub projects only inherit properties from one level deep if run via multiproject. Furthermore, certain "built-in" properties don't get inherited at all.
In the attached code, sub inherits from base which inherits from basebase. When run as a multiproject from the root project (goal: doit->multiproject:clean), sub sees the props defined in base, but not basebase. Also, the property maven.repo.central, overridden in base, retains its default value of login.ibiblio.org
However, running sub directly (from sub's folder with goal "clean") gives the correct behaviour.