How to set a default value for a descriptive flexfield

Summary:

How to set a default value for a descriptive flexfield

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Hi,

we would like to set a default value for a descriptive flexfield (Flexfield Code PER_ASG_DF; Data Type: Date). We would like that this field was automatically filled in with the Hire date of the employee (SELECT min(effective_start_date) from per_assignment_secured_list_v; furthermore we have to introduce a person_id filter, so that if a person had different work relationships, the field is automatically filled in with the hire date of the first/oldest work relationship).