Abstract In the framework of the QCD factorization approach, we study the localized violations of the decay with and without the mixing mechanism and observe that the localized violation can be enhanced by this mixing effect when the mass of the pair is in the vicinity of the resonance. The corresponding theoretical prediction results are ( with the central value form) and ( with the central value form), respectively. Meanwhile, we also calculate the branching fraction of the decay, which is consistent with the experimental results. We suggest that the mixing mechanism should be considered when theoretically and experimentally studying the violation of the B or D meson decays.