Seems if you click enough, the tax site does mention it in some obscure tool. I always thought it only applied to goods.

For the dutch: https://www.belastingdienst.nl/rekenhulpen/diensten_in_en_ui...

Honestly, your accountant sucked. All the rules are about making sure value produced is taxed exactly once. No more no less. If you find a loophole out of that, you better triple check that, because it is definitely not the spirit these tax laws are written in.

Not to blame you - i too would trust a professional. Also, in Holland, accountancy is a protected profession. You can report them, because at the end of the day he/she took a risk that you would likely personally not have taken if you were aware of it.