Migrating from a.06.20 to 7.0

Hello!

Now i'm trying to migrate from DP a.06.20 to 7.0.

Must I first upgrade existing cell manager to 7.0 version? 

I'm confused because I read the following in HP Data Protector 7.0. Installation Guide:

"The upgrade to Data Protector 7.00 is only supported for Data Protector A.06.10, Data
Protector A.06.11, and Data Protector 6.20."