ok I did something as simple as this in functions.php
function display_stockcode_fn($atts) {
$stockcode = types_render_field("stock-code", array("raw"=>"true","separator"=>";"));
return $stockcode;
}
add_shortcode('display_stockcode', 'display_stockcode_fn');
and then attached in an image of the post type for "stock-code"…
it's not displaying anything…dunno what I did wrong.