In the my model, this was declared

address_to  = fields.Selection([( 'sc_address' , 'Contact Address' ),
                                   ( 'location_address' , 'Location Address' )],
                                  string = "Address" ,
                                  default = 'sc_address' )

And this was in the view

<group  string = "Address" >
 <group>​​
    < field  name = "address_to"  widget = "radio"  options = "{'horizontal': true}" />
    < field  name = "frequent_location_id"  invisible = "address_to != 'location_address'" />
  </ group >
</ group >

However, when viewing the form, nothing was selected.

It is weird because another identifier was also declared in the model

freight_collect_prepaid  = fields.Selection([( 'Collect' , 'Collect' ),
                                                ( 'Prepaid' , 'Prepaid' )],
                                               string = "Freight Billing" ,
                                               default = "Collect" )

And in the view, when viewing the form, it was selected.

< group  string = "General Details" >
       < field  name = "bl_number"  invisible = "transport == 'air'" />
       < field  name = "freight_collect_prepaid"  required = "1"  widget = "radio"
                                               options = "{'horizontal':True}" />
</ group >

Where else will I look to correct this, I need the default value to be selected. Should I make it required so it will have a default?