I already have read that documentation and added all the informations according to it.
Sadly it does not have a clear process documented.
It seams that you can only have one running deal per customer (not in documentation written), also the total amount for upgrades/downgrade deals is not the total deal amount per month, it seems to be the differenve amount so the upgrade/downgrade value. Very confusing and not clear.
Total amount (according to documentation) is for me the total deal amount. Just like for renewal and new deals.