The problem here is that OSM cannot differentiate between a supermarket and a discounter.  In Germany, food markets are separate.  A distinction is made between supermarkets (which are a bit more expensive) and discounters (which should of course be cheaper).  That's why Penny, the food discounter, is also called like Aldi, Netto, Norma and so on.  Only here it is not distinguished.  There are only supermarkets here, as they are also branded in the wiki.  A large store that sells groceries is roughly a supermarket here.  Here is the problem for me.  Because Penny is actually a food discounter and not a supermarket.  At least that's how it is in Germany.  The layman can usually not tell the difference anyway.  As already specified in the wiki, I could only make it a supermarket again.