Predicted groundwater concentrations of the FOCUS PRZM shell 2.3.1 may be wrong for parent with two metabolites in the case that all soil locations are selected for the specified crop (e.g. 9 for winter cereals). The error is caused for the second metabolite only by an index problem in the FOCUS shell. PRZM itself is working correct.
Work around: For parent with two metabolites please unselect one of the given soil locations (e.g. n<9 for winter cereals). It is also possible to divide the simulation in to sets using Parent with one metabolite.