Incomplete master data is common, and waiting for it to be fixed before starting digital inspections usually means waiting forever. The inspection system needs to work with what is there and make it easy to fill in the gaps as inspections happen.
In practice that means letting inspectors confirm or add missing details like serial numbers, tags and specifications during the inspection itself, with those updates reviewed and sent back to SAP. Over time the inspections themselves become one of the most reliable ways to clean up the master data.