Hi ,

all you have to do is follow this step , you have two ways to do it , with coding or without coding , i am showing you with coding which is by far more flexible.

1. open your artikle data set py , look for the class and if this artikle is already a module then you may want to inherit it.

   class artikle(osv.osv): _inherit = "artikle"

       _columns = {
               "your_new_field" :  fields.(TYPE----> please refer to 
                           the type of fields available, 
                         https://doc.openerp.com/trunk/server/03_module_dev_02/ )
        }
   

   artikle()

2. make a xml view file and then look for section "inheritance in Views" at https://doc.openerp.com/trunk/server/03_module_dev_03/

3. after make all above edit , shut down and restart the openerp-server services

4. goto the module , if is a new module , then you click install at the module if is a module which already installed , then you click upgrade .

this is a simple steps that hope can help you in any where.