art_40__para_3
3. Economic operators that place on the market or put into service a product covered by a delegated act adopted pursuant to Article 4 shall not prescribe instructions specific to testing that alter the behaviour or the properties of the product in order to reach a more favourable result for any of the product parameters regulated in the applicable delegated acts adopted pursuant to Article 4. For the purposes of this paragraph, instructions leading to a manual alteration of the product, before a test, that alters the performance of the product shall be considered to be instructions specific to testing that alter the behaviour or the properties of the product.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.