I am currently running Odoo v13 Community Edition and I am trying to create new fields.

These fields I am creating are inside the purchase.order.line model. These fields are computed but for me to do that I need to get a field called "currency_rate" from the purchase.order model.

I tried to add this before the function:

@api.depends("purchase.order.currency_rate")

but it did not work.

Then I also tried to get the field by using the following 2 methods

x_unit_price = ... * self.super.currency_rate

and

x_unit_price = ... * super.currency_rate

and both did not work

Does anyone know what can I do to get the field?

PS the currency rate field is different between each Purchase Order

I need help please :)

Thank you in advance