i am creating an automated action in odoo 13.

Objective:

To Create a New Subscription.

Process:

i have a custom date filed on customer screen "Possession Date".

i would like to create a new subscription when ever i set this field.

Problem:

i have an automated action working fine but it always create subscription with same customer and price list and other data no matter on which customer i select this date.

 i want two things to be customer specific.

1. Price List (Property_Product_Pricelist)

2. Customer Name (Partner_id)

Here is the screen shot of my automate action

i think i need some kind of python expression to achieve the results i want, unfortunately i am not good at python, please help...!!!