Solution Manager Upgrade Path

Hi All, Currently I am on Solution Manager EHP 1 for SAPNETWEAVER 7.0 SP 26. I am upgrading our SAP ECC system from SAP ECC 6 EHP 4 stack 9 to ECC EHP 5 stack 8. ( this includes BW and PI Systems ).

My question is - What level do I have to go to in Solution Manager ? I assume that I have to be at that level in Sol Man but I don't know how that relates to ECC EHP 5 Stack Level 9. I know that because of BW content component they have to be in synch across the landscape. When I go into MOPZ and select upgrade it basically comes back with Sol Man 7.1 stack 4.

Or can Sol Man be upgraded on it's own without impact to the rest of the landscape stack... ( i assume not ! )