In this post, you’ll learn more about the Oracle ErrorPLS-00590: attempting to create a subtype UNDER a FINAL type with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
PLS-00590: attempting to create a subtype UNDER a FINAL type
Reason for the Error PLS-00590: attempting to create a subtype UNDER a FINAL type
An attempt was made to create a subtype UNDER a FINAL type.
How to fix the Error PLS-00590: attempting to create a subtype UNDER a FINAL type ?
You can fix this error in Oracle by following the below steps
Avoid deriving a subtype from this FINAL type.