the conditions under which the supporting documents referred to in Article 49 are to be kept, including their form and the time period of their storage.
na coinníollacha faoina gcoinneofar na doiciméid tacaíochta dá dtagraítear in Airteagal 49, lena n-áirítear foirm na ndoiciméad agus an tréimhse ama a stórálfar iad.