Aix 安装XL C/C++编译器后操作系统版本降低

问题描述：
aix版本：6100-07-06-1241
XL C/C++ 版本：11.1.0.1
成功安装XL C/C++之后操作系统版本由原来的6100-07-06-1241降为6100-07-03-1207
[test:root:/]oslevel -s
6100-07-03-1207
[test:root:/]oslevel -sq | grep 6100-07
Known Service Packs
-------------------
6100-07-06-1241
6100-07-05-1228
6100-07-04-1216
6100-07-03-1207
6100-07-02-1150
6100-07-01-1141
6100-07-00-0000
[test:root:/]instfix -i | grep ML
    All filesets for 6100-00_AIX_ML were found.
    All filesets for 6100-01_AIX_ML were found.
    All filesets for 6100-02_AIX_ML were found.
    All filesets for 6100-03_AIX_ML were found.
    All filesets for 6100-04_AIX_ML were found.
    All filesets for 6100-05_AIX_ML were found.
    All filesets for 6100-06_AIX_ML were found.
    All filesets for 6100-07_AIX_ML were found.
    All filesets for 6.1.0.0_AIX_ML were found.
如上显示所有的文件集都已经安装了，但为什么oslevel -s显示的是6100-07-03-1207，不知为何，求大神指教。