1. Check the data of Attributes 1, 2, 3 for old records in Po_Lines_All table.
2. Also check the data for Context filed (which is attribute_category) for old records in Po_Lines_All table - probably this will be null.
3. Update the attribute_category filed with "Yes" value for old records in Po_Lines_All table.
Data will be visible in the application.
Let me know if the above works or if you have any issue.
Thanks. Will try & let you know.