English translation: enforcement in aid of due legal process
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Thanks for your selection of the "combination" answer. However I caution against "enforcement of judicial assistance" - this doesn't make sense to a legal mind. it's about enforcement of a warrant in response to a request for judicial assistance.
The Swiss Federal Prosecutor writes a letter to the Federal Office of Justice. The complete sentence is
"In Erledigung des Rechtshilfevollzuges gemaess Ihrer Eintretungsverfuegung of (date) finden Sie anbei die anlaesslich der am (date) bei der Firma (name) in (City) sichergestellten Unterlagen."