[oe] Why PREFERRED_VERSION setting of <distro>.conf overrules local.conf setting ?

[Hauser, Wolfgang (external)]

Hello,

I want to change some used versions of packages, so I added a
PREFERRED_VERSION_<package>="xxx" for the packages I want to have a
special(newer) version to be used.

But e. g. for busybox the version defined in the used <distro>.conf is
used instead of my setting in local.conf.

Should local.conf not overrule <distro/machine>.conf ??

Regards
Wolfgang Hauser