Vincent,
Well it's not a plain clear as all the other fields are still filled in, only the RowID is getting wiped, so yes I still think it could be worded a tad clearer.
Understanding why it is being done is OK, knowing what the command actually does is what documentation is for?
It shouldn't have to be trial and error in order to figure out how to use it and what to expect that happens.
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Wil