I have a virtual column which calculates a duration between the current time and the latest previous time. When the entry is open for edit, the virtual duration column is correct, but when saving the entry, the virtual column reverts to a duration of...

I have a table with entries where a timestamp is calculated for each row. I also am trying to use some validation rules that disallow overlaps in time for entries.This formula, for some reason always returns zerocount(select(Production[Timestamp],[[_...