cannot drop system-generated virtual column

Solution ID:ORA-12996

Type: Oracle

Cause

An attempt was made to drop a virtual column generated by the system.

Actions

None

Try the following links for this error:

http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm

https://community.oracle.com/message/4169491

https://community.oracle.com/message/9439438

https://community.oracle.com/message/2561959

https://community.oracle.com/message/2099262

https://community.oracle.com/message/3646828

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