a0691627_xporting_and_Importing_Content__import_Behavior
[Case] Root region mismatch for a page Note: A page can only have one root region. [Source] Root region – Region_X [Target] Root region – Region_Y [import Behavior] 
The entire root Region_Y hierarchy is deleted from the target and re-created with the Region_X hierarchy from the source.
Exporting and Importing Content