Let's say you need to refresh a sandbox (TEC) with your Quality Assurance (QA) instance but forgot to take TEC out of the TMS Landscape before the refresh and consequently were unable to afterwards. The Domain Controller for TEC is PRE. This is a two-system landscape but will work with three system landscapes.
The problem is that PRE will not be able to add TEC back into the landscape once post-processing is finished because it never knew it was deleted from the landscape.
This was done on a 4.6C system using Extended Transport Control.
Delete the contents from the following tables:
Now the Domain Controller can accept TEC as a new system and you can use the TMS landscape versioning to retrieve the version of the landscape that you desire.