Once a transport has been imported in the target system, it can NOT be reversed.
However, you could undo the changes contained in the transport by creating a NEW transport in the source system and setting your changes back to the original values/code. The transport this new transport in the target system.
The only alternative to the above approach is to restore the databse to the point in time just prior to the transport going into the target system (keep in mind that a restore reverts the entire SAP system back, including any changes and data not included in the problem transport)
The owner who created the TR can revert that.
Once the configuration have been made in a TR, the developer only know the tables and configuration involved, the developer can always undo the changes or configuration what he made, with a new request in order for an UNDO.
Venkata S Pagolu