to the extent that it is needed
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Member States may require, to the extent that it is needed for safe and correct use of pressure equipment…… to the extent that it is needed “to a certain extent, it is necessary” or “to the degree required””
I think this is reliable; “to a certain extent, it’s necessary.”“
I didn’t read the answers above; I think it’s the latter explanation. After reading what was written above, I feel like both possibilities are valid