ORA-30751: cannot disable column [string] from storing objects of type [string].[string]

Cause: The user is trying to drop a type from being stored in a substitutable column or table. This error is raised due to one of the following reasons :- the column is enabled to store instances of some subtype of the type being dropped.- the column is enabled to store instances of only one type

Action: Fix the cause of the error and retry the operation.

Error Type: ORA

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