  We study CP violation (CPV) in the sneutrino sector within the B-L extension
of the Minimal Supersymmetric Standard Model (BLSSM), wherein an inverse seesaw
mechanism has been implemented. CPV arises from the new superpotential
couplings in the (s)neutrino sector, which can be complex and the mixing of
CP-eigenstates induced by those couplings. CPV leads to asymmetries in so
called T-odd observables, but we argue that such asymmetries also lead to a
wider distribution of those observables. We look at a final state where a
sneutrino decays to a lepton, two jets and missing transverse momentum at the
Future Circular Collider operating in hadron-hadron mode at $100$ TeV and with
a luminosity of 3~ab$^{-1}$. In order to exclude the CP conserving scenario we
need to improve traditional analysis by introducing boosted decision trees
using both standard kinematic variables and T-odd observables and we need
$Z^{\prime}$ boson not too much above current bounds as a portal to produce
sneutrinos efficiently.
