BMW is taking one more crisis measure because they don’t want to risk anything in this period.
In these times, you won’t realize how hard it is to make budget cuts and figure out which projects should be continued and which ones can be delayed. BMW and most automakers have to come up with solutions for the crisis and everyone is trying to save some money. At the moment, they want to cut the production levels and see where that takes them. This is obviously not a permanent measure, but it is just something which BMW is experimenting with.
BMW has a few problems with certain models, but other ones are still creating a huge profit and the profits have increased in certain department. However, better safe than sorry.