Maybe this is trivial... I have wondered why there are big differences between the settlement prices and closes of BUND, BOBL and SCHATZ from time to time. I dared to ask Eurex. Here is a message from them: "the settlement prices for FGBL, FGBM and FGBS are fixed at 17:15 o'clock. The closing auction takes place at 22:00 o'clock."