Hello,
We have a production database in which some columns in table A have been set to "UNUSED" i.e:
ALTER TABLE A SET UNUSED (COLx);

I just realized that a wrong column has been set to unused.
Is there an command to set this column back to a used state ?
I've already tried
ALTER TABLE A SET USED (COLx); it does not work.
Please help.

If there isn't such command, my other alternative is to restore this table from backup.

Thank you