That's not completely true...
I think what they meant was that they can't pay the taxes in bitcoin nor have their prices displayed primarily in bitcoin, and therefore would have to exchange the values to EUR, and probably they don't want to go through the hassle of doing so, hence the "management" excuse.

I built the first legal digital downloads music shop in portugal, and i'm in the process of implementing bitcoin as a payment medium in that same webshop.
Their excuse is so bad, because, for instance, i can accept paypal payments in any currency, but, being my bank account in euros i will only be able to withdraw euros, but there is no legal obligation that tells me I should only accept euros as payment. Of course, by accepting dollars or any other type of currency, like bitcoin, i will have to pay my taxes in euros, so i will need to exchange any other currency i accept into euros.

Disclaimer: I'm not a lawyer, etc, etc, etc, nor am I an accountant, but i have informed myself(and the company I'm working with). Don't take this as the word of law, but only as the informed opinion of someone who is interested in the subject.

Sorry if my reply is confusing, english is not my first language, and when dealing with legal matters, just one word can completely change the meaning of a sentence