Cann't remove ''Manage Asset Group Rules'' from setup tasks

Summary:

I Cann't remove ''Manage Asset Group rules'' from Maintenace setup Tasks although i removed the privilege ''Manage asset group rules''.

Content (required):

Hi,

I created custom role for maintenace users but i'm not able to remove ''Manage Asset Group rules'' from maintenace setup.i removed the privilege ''Manage asset group rules'' but still appears in the tasks as shown in the attached screen,Kindly help.

Regards

Version (include the version you are using, if applicable):

21 C

Code Snippet (add any code snippets that support your topic, if applicable):