Article 23
1.Certificates as referred to in Article 17(1)(b) and (2)(c) issued after the date of withdrawal or suspension of the approval shall not be valid.
2.Member States shall refuse to accept certificates as referred to in Article 17(1)(b) and (2)(c) if they detect irregularities or deficiencies in the certificates. When such certificates have been issued by an SA approved by another Member State, the Member State which detects the irregularities shall notify these circumstances to the Member State which gave the approval.