Each Service Activity that is required to process an Installed Base trackable item must have an Installed Base Transaction Sub Type with the same name as the Service Activity. For example, for the Service Activity named Return for Repair, we define the corresponding Transaction Sub Type with the name Return for Repair.

For items that are not Installed Base trackable, the Service Activities associated with the Repair Type should not have Installed Base Transaction Sub Types defined. Hence you need to have separate
Repair Types and Service Activities defined for Installed Base trackable items and for non-trackable items.