Hi Mario,
yes, this blog article by Randolf Geist is about the extent alignment in case of ASM and a larger AU size. This is what i have mentioned with the last phrase in my previous answer.
However this extent alignment was introduced with 11g in general. You can check MOS ID #1539699.1 for further details, if you have "My Oracle Support" access.
>> Furthermore, do you suggest me to disable alignment by means of the event 60060 ?
It is a trade-off between "space wastage" and efficiency of search/select information during insert/select operations. It also depends on your I/O pattern, but I/O splitting can mostly be "ignored" in case of classic SAP OLTP systems. Oracle itself provides this event as a solution (MOS ID #1539699.1), but as this is a SAP system i would open a SAP SR and get their approval, otherwise SAP support can be very picky in case of issues in the future (just my experience).
Regards
Stefan
P.S.: Your issue can also be related to corrupt LMT bitmaps, but this is speculation only.