I have a db table, t_services, that includes:

    Field('f_service', type='string',
          label=T('Service')),
    Field('f_default_specification', type='text',
          label=T('Default specification')),

Another table, t_line_items, includes:

    Field('f_service', type='reference t_services',
          label=T('Service')),
    Field('f_detail', type='text',
          label=T('Detail')),

I have a form to add to the t_line_items table that has a dropdown box for 
f_service and a textarea for f_detail. I'd like to update the textarea with 
the corresponding t_services.f_default_specification when the an item is 
selected in the dropdown.

I hope that makes sense. Any pointers to how to do this gratefully received.

Thanks.

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