This could be a good feature to be implemented into OCS next release.
This is because BIOS SSN often gets missing when WMI engine fails.
So my approach is to copy the BIOS SSN data field and paste it into FIELD_31 of ACCOUNTINFO field to capture the static data to ensure it is not recapture as missing again.
COPY FROM SOURCE... "SSN" to TO DESTINATION... "field_31"
Or could there be a php hard code logic to check if "Serial Number" or "SSN" field already exist then do not override it with blank or null value. Which is in many cases due to failure corrruption of WMI engine.
This is the solution to my query... it was a inhouse develop solution... I will put this code in a Linux Shell Script and Cron job to schedule a nightly auto update.
Please note FIELDS_42 is created via OCS Application for database consistency.