4. Manufacturers shall ensure that procedures are in place for series production of packaging to remain in conformity with this Regulation. Manufacturers shall adequately take into account changes in packaging design or in characteristics, as well as changes in harmonised standards, common technical specifications or other technical specifications by reference to which conformity is declared or by application of which its conformity is verified. Where the manufacturers find that the packaging’s conformity could be affected, they shall carry out a re-assessment in accordance with the conformity assessment procedure referred to in Article 38, or have it carried out on their behalf.