An unforeseen error occurs when sorting resellers by creation date, i.e. clicking Created column at the page Operations > Resellers:
Detail Message: "org.omg.CORBA.UNKNOWN: Server Exception: Unknown vendor (0x54410000) Minor Code: 640 vmcid: 0x54410000 minor code: 640 completed: Maybe".
The issue is caused by the bug POA-84974.
The issue will be fixed in future versions of POA. Please contact your Account Manager to trace its status.