Errors in source documents

Bossel, System Zoo, model Z407

The book gives the equation for nutrient saturation as:

nutrient saturation=

(nutrient uptake/(SATURATION CONSTANT+nutrient in soil))*seasonal dependence

(though 'nutrient uptake' is not shown as influencing variable)

but the Vensim file gives it as

nutrient saturation=

(nutrient in soil/(SATURATION CONSTANT+nutrient in soil))*seasonal dependence

The latter must be correct, since the former causes a circular influence chain.