Every time a released change set is transported, both automatically and manually, an entry is recorded in the transport history for the change set. Both inbound and outbound transport history is maintained on each system to facilitate the full audit trail of a change set.
For example in a 3 system landscape for development, testing, and production, the following entries are created when transport "Release 0618" change set. When the change set is transported from development to testing, the outbound transport history entry is captured on the development system and the inbound transport history is captured on the testing system. When the change set is transported from testing to production, the outbound transport history entry is captured on the testing system and the inbound transport history is captured on the production system.
The transport history details include the transport type - automatic or manual, the target system to which the change set was transported, the user who transported the change set and the date and time when the change set was transported.