Shyam,
This is fixed or planned fixed in 6.0.46 Agentry Server (supposed to be available anytime soon in the Service Marketplace - it was submitted already to the SMP team). The fix was in SMP 2.3 and SMP 3.0 but it was ported back to the Agentry 6.0.X release. If you have no access to the Agentry 6.0.X patches this means that your SAP License is preventing you from downloading it. You may need to contact the SAP CIC (customer interaction center) group.
Or you can do the manual setup for a workaround for now.
SAP KBA article: 2048202 - AgentryGUI does not allow to change log settings - Not all setttings were successfully changed.
Regards,
Mark Pe
SAP Senior Support Engineer (Mobility)