Hi everyone,

Consider the following situation: 

User1 and User2 in Department A

User3 and User4 in Department B

I'm using Odoo v8, I set the domain in user_id field to filter the only users in selected department will display.

<field name=department_id"/>

<field name="user_id" domain="[('department_id','=',department_id)]"/>

The problem now is when the department_id field is not selected, there is no users to select in user_id field.

How should I set the domain so that when I choose department, user_id field will display users in that department only and when I not choose any department, user_id field will display all users.

Thanks.