Answer given by Mr Breton on behalf of the European Commission
The Commission takes all the necessary measures to ensure full compliance of Member States with Regulation (EU) 2019/515 on mutual recognition of goods and is not aware of unacceptable barriers to trade for economic operators in relation with this regulation. In case of decisions restricting or denying market access in the Member State of destination and upon request of a Solvit centre, the Commission issues an opinion on the application of the regulation by the competent national authorities. The Commission may also exercise its enforcement powers in case of systemic problems identified as regards the application of the principle of mutual recognition.
In principle, the competent national authorities should take into account test reports or certificates issued by a conformity assessment body provided by the economic operator, irrespective in which Member State the certificate was issued .
-  https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32019R0515&from=EN
-  The Internal Market Problem Solving Network : https://eur-lex.europa.eu/legal-content/EN/AUTO/?uri=OJ:L:2001:331:TOC
-  See Recital 40 of Regulation (EU) 2019/515.
-  See Article 5(8) of Regulation (EU) 2019/515.