Hallo,
das ist bei den Defect Ptfs beschrieben:

04 Apr 2011 DEFECTIVE PTF(s): MF52644 for i 6.1 * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * *MF52612 for i 6.1.1 * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * *MF52618 for i 6.1.1 * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * *MF52658 for i 6.1.1 * * * * * * * * * * * *
* * * * * * * * * *LICENSED PROGRAM = 5761999 * * * * * * * * * * * * * * * * *
* * * * * * * * * *APAR NUMBER: MA40798 * * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* * * * * * * * * *USERS AFFECTED: All IBM i operating system users * * * * * *
* * * * * * * * * * * * * * * * * *with the defective LIC PTFs MF52644, * * * *
* * * * * * * * * * * * * * * * * *MF52612, MF52618 and/or MF52658 * * * * * * *
* * * * * * * * * * * * * * * * * *applied. * * * * * * * * * * * * * * * * * *
* * * * * * * * * *REASON DEFECTIVE: SRC B600 0102 experienced during * * * * *
* * * * * * * * * * * * * * * * * * *IPL after applying the PTFs. * * * * * * *
* * * * * * * * * *RECOMMENDATION: Remove defective LIC PTFs MF52644, * * * * *
* * * * * * * * * * * * * * * * * *MF52612, MF52618 and/or MF52658 * * * * * * *
* * * * * * * * * * * * * * * * * *before applying the fixing LIC PTFs. * * * *
* * * * * * * * * * * * * * * * * *Apply the fixing LIC PTF MF52848 for * * * *
* * * * * * * * * * * * * * * * * *i 6.1. * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * *Apply the fixing LIC PTF MF52847 for * * * *
* * * * * * * * * * * * * * * * * *i 6.1.1. * * * * * * * * * *