Apple Defends iTunes in Berlin

So here's a little international commercial law news. Apparently, a commission that oversees music sales in Europe has called out Apple for charger higher prices for songs on iTunes in certain countries in Europe. Now this article doesn't go into much depth about why Apple was charging prices or even why it is wrong but there are a number of possible reasons. There could simply be a higher demand for digital music in certain countries and Apple may be using this to their advantage. Then again, their costs to sell the music in certain countries may be higher. What ever the reasoning is behind this situation, the overseeing commission is not happy.

Now I am not exactly a pro at European commercial law, but it seems to me that such price structuring should not be considered illegal. I mean even in the US, if apple wanted, they could charge different prices to people in different areas of the country. It can relate to the cost of living and of course supply and demand. So what is the problem in Europe? Is there some sort of trade code that doesn't allow price fluctuations from country to country for online purchases? I highly doubt that considering that the standard of living varies so greatly among the countries in the European Union. I guess I just don't really understand what the legal problem is here.