28In that regard, it must be noted, firstly, that the essential feature of a charge having equivalent effect to a customs duty which distinguishes it from an internal tax is that the former is borne solely by a product which crosses a frontier, as such, whilst the latter is borne by imported, exported and domestic products (see, to that effect, judgment in Michaïlidis, C‑441/98 and C‑442/98, EU:C:2000:479, paragraph 22).
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