Query User Group Mapping To Role

Dear All,

I understand that a query user group can be mapped to one authorization role, this is standard behavior (Transaction SQ10).

However, when I look in my current system (DEV) I can see that more than one role has been mapped earlier to one Query User Group. If I now try to simulate the same then I get an error that an earlier role is already assigned.

For e.g I have a role X that is already mapped to infoset query user group /SAPQUERY/H9. When I try to assign another role Y to this query user group I get an error as shown below:

Any ideas on how multiple roles would have been mapped to a single query user group?

We are on ECC 6.0 SP 2.

Regards,

Avinash