You upgraded from Acronis Backup Advanced 11.7 to Acronis Cyber Backup Advanced 12.5 and then to Acronis Cyber Protect 15.
When you try to create or edit a protection plan, the operation fails with the following error:
POR: cannot assign units of different types
Issue in the product.
There is no workaround at the moment.
This issue will be fixed in one of the upcoming updates of Acronis Cyber Protect 15.