Hi,
To write value into the record either you can use the write method or you can update like a dict.

Most probably you may be using the . operation to assign the value and thus getting the error. In the automated action or in the server action, you cannot assign value using the . operator.

record.field_name = value this method is wrong

Instead:
record.write({'field_name': value})   or record['field_name'] = value

Thanks

Hi,

Try this code :

      for record in self:

           if record['zip']:
               postal_code = str(record['zip'])
               department = postal_code[0:2] 
                record['x_studio_department'] = department

Hope it helps