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This step erases all data in the scope of the ne, then imports the data.
For example, if you are importing SPACE1 and have mapped SPACE1 into SPACE2, then it will erase all Requirement Yogi data related to that space, and apply the import.
Confluence must not restart during this import. If it does, reapply the import. If you close the page, it doesn't stop the process, and you can easily come back to monitoring the progress using the "Queue" tab (or reopening the previous URL).
Step 7 - Check the data
If you are unhappy with the import (wrong page ID, wrong issue ID), then please come back to the Mapping page (step 5), fix the problem, then reapply the import.
If you are happy with the import, then don't forget to delete the temporary data (delete from the UI) and the file on the disk.