OCI-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.
        
     
    
    
        OCI-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.
        
     
    
    
        OCI-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.