In the release version currently, we require that time in monotonic within an individual. We understand that other programs allow a reset option and EVID=4 from NONMEM allows you to reset both dose and time. We already handle resetting the compartment state, but not time and this will be available in the next release. Until then, you have would have wrangle the time in your dataset such that it is monotonically increasing within a subject. We will make an announcement when we make this change.
Note that the compartments are reset with evid=4 when you make change your dataset as suggested above.