Question on BI 7.1 and upgrade path to BI 7.3

Hello All,

As a Basis consultant, I have the experience of Upgrading BW 7.0 to BW 7.3 in a 2 Step Upgrade process via BW 7.01

Now I have a requirement to upgrade BI 7.1 to BI 7.3

My questions are

1. To my knowledge this is the sequence of versions for BW:- BW 7.0, BW 7.01, BW 7.3 - Is this correct?

2. If yes what is BI 7.1 ? Where does it fit into ?

3. What is the Upgrade path to BI 7.3 ?

Thanks!