Schedule Activity form:

i want to mark readonly 2 fields in Vew, activity_type_id and date_deadline, code working for activity_type_id but NOT working for date_deadline... is there anything else for a date type field or i am doing something wrong? please help.

field name="activity_type_id" required="1" options="{'no_create': True, 'no_open': True}" attrs="{'readonly': [('activity_type_id', '!=', False)]}"

field name="date_deadline" attrs="{'readonly': [('date_deadline', '!=', False)]}"

regards