How do you change the default value on a CCK text field that is part of a field group via hook_form_alter()?
You should be able to do something like this:

function EXAMPLE_form_alter(&amp;$form, &amp;$form_state, $form_id) {

  if ($form_id=='profile_node_form') {
    $form['group_company_profile']['field_pro_type'][0]['#default_value']['value'] = 'hello world';
  }

  // all other form alters here...

}


or

function EXAMPLE_form_profile_node_form_alter(&amp;$form, &amp;$form_state) {

  $form['group_company_profile']['field_pro_type'][0]['#default_value']['value'] = 'hello world';

}


directly from whichever form_alter() style you like.