Hi,

To change the property of an existing field, what you can do is that inherit the corresponding model first and,

class AccountAccountType(models.Model):
    _name = "account.account.type"
    _description = "Account Type"

    name = fields.Char(string='Account Type', required=True, translate=True)

Above code is from the account module, suppose if i need to change the field to required to False, what i have to do is that as follows,

class AccountAccountType(models.Model):
    _inherit = "account.account.type"

    name = fields.Char(required=False)

Thanks