Based on what OP stated. The one liter added put you over perhaps a quarter of a liter. This is nothing to worry about. I had this discussion with BMW. I was advised from a solid source, that BMW will be changing the limit for overfill because it is too sensitive to overfill. Apparently a liter over will not trigger an overfill in the future. Just what I heard. Honestly, even if this were not true, a quarter or a half a liter over is nothing. Also it takes a number of measurements to get a good reading. If only they invented a thing to check oil with, like a dipstick thing.
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