For the help entry entitled Duplicate Record/Request, this sentence is not 100% true:
"If the record has a field set up for automatic entry of values, this script step does not duplicate the value in the field of the current record. In that case, FileMaker Pro generates and enters a new value for the duplicated record."
That sentence is true MOST OF THE TIME, except for lookups and auto-entered calculations. For both lookups and auto-entered calculations, FileMaker actually DOES duplicate the value in the field.