Group owner cannot view group members

Hi

I recently created a second sub-role from MyDistributionGroup and removed from them role entry create and remove distribution group and assign it to Default Role Assignment Policy.

After that I create a universal-distribution group. A manager was successfuly add a couple of users, but he cannot view members of that group. He was doing it in Outlook 2010.

What is a reason of that ?

Has anyone an explanation of that?

Sorry for my english

Regards

Pit