Can I use the out-of-box Web Services?

The ITIL-standard Web Services provided with Service Manager should be used whenever possible. They have been tested extensively and are well documented, which makes them easier to use. If you are interested in using one of these Web Services, we recommend that you do not modify the out-of-box extaccess records. Instead, always create your own copy if you need to add actions or fields. If the changes are unique, create a copy of the extaccess record(s) involved first and name the service differently; for example, IncidentManagementForPortal rather than just IncidentManagement, and make your changes against the new set of extaccess records.