There are a few places where it is possible to select a defined service.
These fields should be sortet (order by servicename)
In the search field: opennms/element/index.jsp
In admin/editProvisioningGroup.htm when adding a service to an interface
or another one in admin/node/add.htm "Surveillance Category Membership"
If you know other places where a larger select box is used, feel free to sort them too. That makes a lot of things much easier.