After reviewing the documentation available, I haven't found a "safe" way to change the edition of Cyber Backup/Cyber Protection to a customer. The only way I see possible is as follows:
Get all offering items of customer currently enabled in backup service.
Disable all those offering items.
Get all offering items available to the customer in the edition she wish to change into.
Enable for the customer all those offering items recovered in the point 3 in backup service.
This way of doing the edition change is kind of dangerous to say the least, in particular because of the possible configuration issues that might arise doing it like that. Isn't there a better way to do this through API?