Oracle Solution for Error ora-30751

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

.string

What triggered the Error:

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 typ.

What should we do to fix it:

Fix the cause of the error and retry the operation.