Hi Diogo,
This is not supported for the sole reason that once you create a service type, and it gets used, and attached to other objects (tickets etc.) where it may be referenced by name on some objects rather than by id, if the name is changed, the objects referencing that service type will then have a dangling reference to it, thus we do not support the changing of a service type name. If you need to change the name on a service type, you can simply re-create it with the correct name, and inactivate the original one. This way anything that still references the original one wont break. We do NOT support using pdm load to update the names.
Hope this helps
Thanks,
Jon Israel
Principal Support Engineer
CA Technologies