In this note is presented the systematic effect in the flavour tagging due to the trigger selection. We present a possible way to correct for the different wrong tagging rates for control and signal channels needed for the evaluation of some of the CP asymmetries that will be measured in the experiment. This study is performed at the generator level and uses as decays, Bs2DsPi as the control channel and Bs2PsiPhi and Bs2KK as signal channels
