ORA-02296

Error: ORA-02296: cannot enable (string.string) - null values found

Causa: An ALTER TABLE command with an ENABLE CONSTRAINT clause failed because the table contains values that do not satisfy the constraint.

Acción: Make sure that all values in the table satisfy the constraint before issuing an ALTER TABLE command with an ENABLE CONSTRAINT clause. For more information about ALTER TABLE and ENABLE CONSTRAINT, see the Oracle9i SQL Reference.