Once you successfully upgraded the PO system there are some post steps which I identify based on customer requirement and some of them are common –
1. Update SLD CIM and CR Content – This can also perform before 7.5 upgrade as well.
2. Download and Import SAP_BASIS 7.5 SP26 TPZ File in Enterprise Service Repository
3. Download and update B2B addons versions (via SUM) and import TPZ file in Enterprise Service Repository
4. Maintain service/protectwebmethods parameter in DEFAULT.PFL and restart sapstartsrv service to avoid Grey out – NWA System Overview.
I will update the list more –