  We show that the factorization assumption in colour-suppressed $B$ meson
decays is not ruled out by experimental data on $B \ra K(K^*) +
J/\Psi(\Psi^{'})$. The problem previously pointed out might be due to an
inadequate choice of hadronic form factors. Within the Isgur-Wise SU(2) heavy
flavour symmetry framework, we search for possible $q^2$-dependences of form
factors that satisfy both the large longitudinal polarization $\rho_L$ observed
in $B \ra K^* + J/\Psi$ and the relatively small ratio of rates $R_{J/\Psi} =
\Gamma(B \ra K^* + J/\Psi)/\Gamma(B \ra K + J/\Psi)$. We find out that the
puzzle could be essentially understood if the $A_1(q^2)$ form factor is frankly
decreasing (instead of being almost constant or increasing as commonly
assumed). Of course, the possibility of understanding experimental data is not
necessarily a proof of factorization.
