You can use do_shortcode()
echo do_shortcode($post_customs["project_items_".$i."_edit_proposal_item"][0]);
More : http://codex.wordpress.org/Function_Reference/do_shortcode
You can use do_shortcode()
echo do_shortcode($post_customs["project_items_".$i."_edit_proposal_item"][0]);
More : http://codex.wordpress.org/Function_Reference/do_shortcode