Hi, we had direct communication about this, we suspect it is caused by processes that have an amount of 0 for their reference products on the output side or 0 for reference waste on the input side. Can you please check?
While these processes are not contributing anything and thus can be considered as not correct, we agree that this can occur maybe and we will capture these cases in a next version. So, thank you for confirming whether this is the case also for you.