It means you need to add an Ekos Scheduler Job before you using Mosaic Tool. This is because Mosaic tool can create many sub-jobs each for a particular region. So you create a job with target + sequence file, select conditions and such, click "+".. you see the job, then create Mosaic.
If you come up with a better wording, please let me know.
if i well understood, i must in first create a job in the scheduler, like anywhere job, on the DSO target that will "mosaiced" with my sequence and after, only after, with the mosaic tool, create all sub-jobs. That is good ?
i thought, may be in wrong, that only the jobs created by the mosaic tool been enought.