I am trying to create a read-only field x_total_salary in hr.contract model in Odoo 10 in web debug mode (I dont have access to the module code files) which would show the total gross salary in the contract creation form. Value of x_total_salary should be simple addition of the fields: wage + x_conv_alw + x_med_alw + x_other_alw in the same model which I tried to put in the "Compute" box of x_total_salary. I put <field name=" x_total_salary"/> in the contract creation form which unfortunately shows 0.

Any idea how to put such simple calculation in the computed fields please?