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



PLS-00648: type of supertype attribute "string" can not be a subtype or reference to a su..

Answer / guest

Cause: 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.

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

Please add more information about this Error

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