Hi,

In Odoo12: Invoicing / vendor / payment form, i inherent and created new fields

-check_number_char

-check_number

In account.payment.py model i create the following codes

def create (self, vals):   * it run all right.

        rslt = super (AccountPayment, self) .create (vals)

       rslt.update ({ 'ck_number': vals.get ("check_number_char")   })

        return rslt

* cant find the write function of it so i created a new one *

@ api.multi

    def write (self, vals):   * this is where i got the error when try to edit/save it.

             #update the check_number_char to check_number (readonly)

              self.check_number = vals.get ("check_number_char")

I lost , need you help!

Thank you for taking time to read and reply.