Most people log "hours in the past", and need to, because they often finish a task and then log it later.
That said, yes, you don't want people going back and amending logs after you've started reporting off their logs and your processes say they need logs in at a reasonable time, so it's perfectly reasonable to ask for this.
I'd want to start by asking what your rule for "past dated" is?
As an example, my group finds weekly reporting useful, but monthly very important, so we "lock" the timesheets (Tempo allows us to do this) a few days after month end. Your rule could be very different - maybe every week, or possibly process driven - if an issue is "closed", you don't want logs to be added or edited. And so-on.
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