How to fix the Oracle error PLS-00648: type of supertype attribute “string” can not be a subtype or reference to a subtype in this release?

In this post, you’ll learn more about the Oracle ErrorPLS-00648: type of supertype attribute “string” can not be a subtype or reference to a subtype in this release with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00648: type of supertype attribute “string” can not be a subtype or reference to a subtype in this release

Reason for the Error PLS-00648: type of supertype attribute “string” can not be a subtype or reference to a subtype in this release

User tried to complete a type, Tsub as a subtype of another type, Tsuper where Tsuper contained an attribute of type Tsub or of type REF to Tsub. This is an implementation restriction.

How to fix the Error PLS-00648: type of supertype attribute “string” can not be a subtype or reference to a subtype in this release ?

You can fix this error in Oracle by following the below steps

Change the design of code to not use any type with attribute whose type is of subtype or REF to subtype.