Answer / guest

Cause: Modification to the attribute did not widen its
constraints or attempted to change the type of the
attribute. For NUMBER type attributes, scale and precision
can be changed to allow increase in number of digits after
and before the decimal point. For VARCHAR2 and RAW type
attributes the size can be increased. Other type attributes
are not allowed to be modified. Change of type of attribute
is also not allowed.

Action: Change the constraint specification so as to widen
the existing constraints.To narrow the constraints or to
change the type of the attribute, you must drop the
attribute and add it with new constraints or new type. In
that case you must also take appropriate steps to preserve
your existing data based on the type (if you want to
preserve it).Typically this will involve backing up the data
and restoring it after the ALTER TYPE.

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