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Charge Parity asymmetry in charmless B meson decays is a key issue to beunderstood. Many theoretical calculations have been performed using shortdistance factorization approaches which, in general, do not take into accountthe CPT invariance constraint. For each channel with CP violation there is anequal amount of CP asymmetry in another channel or other channels, with anopposite sign. This happens if these channels are coupled through final stateinteractions (FSI). In the specific process $B\to PV$, involving onepseudo-scalar and one vector particle in the final state, we argue that the CPasymmetry, inherent from a short distance mechanism, could be suppressed due tothe CPT constraint. In this case, we propose a sensitive and practicalexperimental method to identify even a small CP asymmetry, which provides thevalues for $A_{CP}$ without the need for an amplitude analysis. This method, ifapplied directly to data, will enable to extract the CP asymmetry informationin a model independent way and check to which extend the suggested suppressiondue to the CPT constraint is verified.

Suppressed $B \to PV $ CP asymmetry: CPT constraint