(54)It is necessary to provide for the categories of animals and goods which should always be presented at a border control post for official controls to be performed prior to their entry into the Union. It is also necessary to provide for the possibility of requiring that other categories of goods be subject temporarily to the same requirement by virtue of specific measures to that effect, and for the possibility of requiring that certain other categories of goods, and in particular certain foodstuffs containing both products of plant origin and processed products of animal origin (composite products), always be presented for official controls at a border control post prior to their entry into the Union.