Hi Folks,

I added two fields in my model:

• x_ticket_duration: float

• x_ticket_duration_sum: float

• 
  

I want to be able to enter a floating number into x_ticket_duration. This float should then be added to the value in x_ticket_duration-sum.

Formula:

x_ticket_duration_sum += x_ticket_duration

In odoo I made x_ticket_duration_sum dependent on x_ticket_duration. I checked the box to store both values.
In the compute fields for x_ticket_duration_sum I wrote:

self['x_ticket_duration_sum'] += self['x_ticket_duration']

Now when I go to the view I see both fields and when I edit the record the x_ticket_duration_sum is always the same value as x_ticket_duration. But it never saves the sum. I see the value for x_ticket_duration_sum is saved on the DB but when I edit the record again and enter a new float in x_ticket_duration it just writes this value into x_ticket_duration_sum but it doesn't calculate the sum.
Does anybody know how to achieve this?

Thank you and cheers