Unable to remove security group from OU advance permission due to inheritance + Active directory 2012

I had this question after viewing windows security.

I am trying to remove one of the security group which has inherit permission on one of my OU in Active Directory.
When i click on remove i get the message " You cant remove xxx group (Domian\xxxgroup) because this object if inheriting permissions from its parent. To remove "xxx group" you must prevent this object from inheriting permissions.
Turn off the option for inheriting permissions, and then try to remove the xxxgroup again.


I am using a Windows 2012 AD, when i click on disable inheritance by selecting this security group called "xxxgroup" it removes the inherit poermission onot only for that but all the other ACE that are defined fro the group, which does not solve the problem.

Any help is much appreciated.i am stuck int his for hours now finding a solution
Farookh ShaikhInfrastructure support EngineerAsked:
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Went you enable inheritance you need to select Copy Existing Permissions. Did you?
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Farookh ShaikhInfrastructure support EngineerAuthor Commented:
When i click on Disable inheritance tab i get the attached 2 options. I have tried both and it does not server the purpose. It removes inheritance for all objects in this OU
Error2.jpg
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Convert is the option to select. If that doesn't work your MMC is buggy. Check if there are any updates or try from another computer.

Otherwise, you need to use DSACLs.exe
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Farookh ShaikhInfrastructure support EngineerAuthor Commented:
What we have decided is let the allow ACE be there since they are inherited and cant be removed or modified.

Will create 3 new ACE for below:

1. Create/Delete group objects - This object and all descendant objects - Deny
2. Create/Delete user objects - This object and all descendant objects - Deny
3. Delete - This object and all descendant objects - Deny

Thanks for your responses.
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Farookh ShaikhInfrastructure support EngineerAuthor Commented:
I have leaned that Inherited permissions cant be changed at OU level in 2012, we have to remove the inheritance from parent level.
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