Attention is drawn to the fact that the numerical code ESCAPE by Rodr¿guez-Fr¿as et al. <2001> is in conflict with other models of charge-changing processes in solar corona, including the most reliable model by Arnaud and Raymond <1992>. We find in the >0.1 MeV nucleon-1 energy range a tendency of the ESCAPE code to overestimate the ionic charge of iron. This implies an underestimation of the density ¿ acceleration-time product in the ion acceleration region in solar corona.