From Frank Bergmann
Today I came across a possible bug in RoadRunner, that has been slumbering there for eternities. So I was wondering whether a test case would have helped me (and perhaps a gazillion other SBML simulator developers). Do you currently have a test in the test suite that tests: hOSU together with non unit compartments and raterules on a non-constant boundary species? The idea would be to have to tests: one with hOSU true and one with it being false.
back when I implemented raterules I must have misread the description in the spec:
In the case of a species, a RateRule sets the rate of change of the species’ quantity to the value
determined by the formula in math.
to mean substance/time and thus came to different results!