(a)they have demonstrated to the competent authority the necessary knowledge of the applicable rules relevant to the examinations carried out in accordance with Article 87 of Regulation (EU) 2016/2031 concerning the Union quarantine pests, pests subject to measures adopted pursuant to Article 30(1) of Regulation (EU) 2016/2031, protected zone quarantine pests and Union regulated non-quarantine pests that could affect the plants, plant products and other objects concerned;