Digits not use to size numeric field
On tryton, the numeric field has a size that follow the number of digits but not for sao so we could have too small (see https://discuss.tryton.org/t/expand-numeric-fields-with-big-amounts/2597).
On tryton, the numeric field has a size that follow the number of digits but not for sao so we could have too small (see https://discuss.tryton.org/t/expand-numeric-fields-with-big-amounts/2597).