A user in CAPC has administer group user access to a group but is unable to edit the sub group of group for which he has access.
Release : 3.7
Component : IM Data Aggregator
From the Docs A user with 'Administer Groups' role right can create groups under the selected group or subgroups. They can then modify or delete only those administered groups. The user cannot modify or delete groups that another user owns.
For more information, see Role Rights.