E-Business Suite upgrade database to 19c datafile warning
Interoperability Notes: Oracle E-Business Suite Release 12.2 with Oracle Database 19c (Doc ID 2552181.1)
Contains this warning regarding the hcheck.sql script:
Note: One critical check the script performs is to see if there exists a SYSTEM datafile that has a relative file number with the value of 1. If you encounter this error, do not proceed with any further steps in this document. You will have to work around the issue by running export/import instead.
I have run hcheck.sql against a test EBS instance that has a system datafile with a relative file number value of 1. But the script did NOT report this as an issue.