Activating Format Trees 
You always maintain version 001 of the DMEE format tree. After you create or make any changes to your format tree, you need to activate it so that calling applications can use it to generate or convert a DME file.
Procedure
Complete maintenance of the format tree.
Choose
Format tree 
Activate 
or 
(Activate).The system checks the format tree.
Note
If your DMEE format tree is very large and its activation therefore results in a timeout, you can activate the format tree in the background using the DMEE_ACTIVATE_TREE program in the SE38 transaction.
Result
If the check determines inconsistencies (errors or warnings), the system saves the format tree in the maintenance version, 001. To activate the tree, you must first correct all errors and then repeat the activation procedure.
If no errors are determined, the system activates the format tree and saves it as the active version, 000.