An active substance from China needs three things: manufacture to EU GMP, a written confirmation from the medical products administration of the province where the site is located, and, for the marketing authorisation, an EDQM CEP or, if no CEP is available, an Active Substance Master File (ASMF, formerly Drug Master File). The EU manufacturer of the medicine must also qualify the supplier itself.
Finished medicinal products from China need the manufacturer's GMP certificate, import under an import authorisation, retesting of every batch in the EU and certification by a Qualified Person. No written confirmation is needed for them, even if the API comes from China. There is no agreement with China that waives retesting.