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We discuss the uncertainty related to the amount of unwanted $B\to K_0^\ast(K\pi)\ell^+\ell^-$ events in the sample of $B\to K^\ast (K\pi)\ell^+\ell^-$.Those events can increase the measured differential decay rate by up to 10% inthe low $q^2$ region, and can be a source of non-negligible uncertainty in thefull angular distribution of the $B\to K^\ast (K\pi)\ell^+\ell^-$ decay.Although the transverse asymmetries should be unaffected by the presence of the$S$-wave $K\pi$ pairs, coming from the scalar $K_0^\ast$ meson, we show that inpractice their normalization might be sensitive to those events and couldentail a sizable uncertainty in transverse asymmetries around $q^2=2 GeV^2$.For other $q^2$'s that error is under about 10%.

Impact of $B\to K^\ast_0 \ell^+\ell^-$ on the New Physics search in $B\to K^\ast \ell^+\ell^-$ decay