The SSM solution in version 7.5 did support data loading from a BOBJ Universe...Since SSM10+, using a universe to load data into the SSM Application Server(PAS) is not supported.
What I tend to do, which helps empower the business users to load KPI data, and not be reliant on IT, is for the business user / SSM administrator to create a Web Intelligence report that contains the necessary data to load a KPI such as Date, KPI name, Actual, Target (and any dimension members if applicable). That webi report can be scheduled to output a CSV file. You can then use some basic load procedure scripts to upload the CSV file....
Cheers,
Les Smith