German ATM surreptitiously charged a fee of €9, without receipt

I wrote previously about German ATMs neglecting to give receipts.

After receiving my bank statement, it shows that an ATM charged a fee, which was not disclosed at the time of the transaction. Every ATM I used a non-SEPA card in mentioned no fee, which I found surprising because non-SEPA cards are almost always charged a fee within SEPA in my past experience. At the time I thought perhaps the ATM operators simply decided to treat all cards as SEPA cards, perhaps for simplicity.

Some machines indeed charged no fee in the end. None of them offered a receipt either. But one ATM charged €9, the highest ATM fee I have ever seen.

Can this be legal?

The link is to a Dutch site, but it shows that in NL producing a receipt is not an obligation. Which in the very least suggests the EU allows a situation where receipts are unavailable.