When pruning, subcatchment drainage manholes are reassigned to the first modeled downstream manhole. However, when pruning subcatchments that drain to single or multiple links, ICM gives incorrect results in some cases and doesn't work at all in other cases, which then causes validation errors after pruning. I submitted this as a bug since it gives incorrect results, but Innovyze asked me to submit is as a "feature request". So please vote for this so it can be fixed and work correctly.
