  We show that the simultaneous determination of the leptonic CP-odd phase
$\delta$ and the angle $\theta_{13}$ from the subleading transitions
$\nu_e\to\nu_\mu$ and ${\bar\nu}_e\to{\bar\nu}_\mu$ results generically, at
fixed neutrino energy and baseline, in two degenerate solutions. In light of
this, we refine a previous analysis of the sensitivity to leptonic CP violation
at a neutrino factory, in the LMA-MSW scenario, by exploring the full range of
$\delta$ and $\theta_{13}$.
  Furthermore, we take into account the expected uncertainties on the solar and
atmospheric oscillation parameters and in the average Earth matter density
along the neutrino path. An intermediate baseline of O(3000) km is still the
best option to tackle CP violation, although a combination of two baselines
turns out to be very important in resolving degeneracies.
