[gentoo-portage-dev] USE_EXPAND in profiles?

[Joakim Tjernlund]

Under /etc/portage/package.use one can add:
  sys-libs/ntdb PYTHON_TARGETS: python2_7
  net-fs/samba  PYTHON_TARGETS: python2_7

But when I try to transfer this to our custom profile I get
--- Invalid USE flag for 'sys-libs/ntdb' in '/var/lib/layman/transmode/profiles/gentoo64-common/package.use': 'PYTHON_TARGETS:'
--- Invalid USE flag for 'net-fs/samba' in '/var/lib/layman/transmode/profiles/gentoo64-common/package.use': 'PYTHON_TARGETS:'

I am missing something? 
Generally I think that everything possible to do under /etc/portage should be
doable under a profile as well.

    Jocke