How can I add a system later in case the system ID of my production system is unknown?

You will be required to create a new data set in your development system in case you want to add another system (test or production). In step 'Use Cases' in the implementation Tool for System Connection the user needs to select the 'Maintain the system Landscape'. The data will be proposed by the system for a current client. The data is not required to be changed. A system connection can be added to the new system.

The systems which have already been maintained can also be added, as per your wish, but it is not mandatory. The system tool for warehouse connection can be again started and a new data set can be subsequently created which contains one more logical system. In case you have already changed the settings for the standard warehouse you need to select 'Implement your own warehouse' in step ‘Use case’.