I just had exactly the same issue. Thank god I saw this or I would of spent ages trying to figure it out.
I had to rename my post type order to purchase_order and that fixed problem.
So weird.
I wasn’t using Custom Post Type UI plugin, I just had my post type hard coded with this…
<?php
class Types {
/**
* Types constructor.
* @param null|int $id The Player ID to load
*/
public function __construct ($id = null) {
if(is_null($id)) {
// on initial theme load, run various actions
add_action('init', array ($this, 'action_init'));
}
}
/**
* Method to run on WordPress initialisation
*
* @uses init action
* @see https://codex.wordpress.org/Plugin_API/Action_Reference/init
*/
public function action_init () {
// register our post type
$this->register_post_types();
}
/**
* Returns an array of order labels available
* to the labels post type
*
* @param null|string $key The specific label to load
* @return array|string Array of labels or single
* if key is defined
*/
public static function order_labels ($key = null) {
// create our array of labels
$aLabels = array (
'name' => 'Orders',
'singular_name' => 'Order',
'add_new' => 'Add order',
'add_new_item' => 'Add new order',
'edit_item' => 'Edit order',
'new_item' => 'Create order',
'view_item' => 'View order',
'search_items' => 'Search orders',
'not_found' => 'No orders found',
'not_found_in_trash' => 'No orders found in trash',
'parent_item_colon' => 'Parent order:',
'all_items' => 'All orders',
'archives' => 'Order archives',
'insert_into_item' => 'Insert within order',
'uploaded_to_this_item' => 'Uploaded to order',
);
// check if we are returning a single label
if(!is_null($key) && array_key_exists($key, $aLabels)) {
return $aLabels[$key];
}
// by default return all labels
return $aLabels;
}
/**
* Registers post types
* @return void
*/
protected function register_post_types () {
// register our field post type product
register_post_type('order', array (
// define our post type labels
'label' => self::order_labels('singular_name'),
'labels' => self::order_labels(),
// make post type public queryable
'public' => true,
// setup UI preferences
'show_ui' => true,
'show_in_nav_menus' => true,
'show_in_menu' => true,
'show_in_admin_bar' => false,
// set our menu position and icon
'menu_position' => 50,
'menu_icon' => 'dashicons-list-view',
// determine our capabilities & support
'capability_type' => 'post',
'supports' => array (
'title', 'author', 'editor'
),
// archiving and linking
'has_archive' => false,
'rewrite' => array (
'slug' => 'order',
'with_front' => false,
'feeds' => false,
'pages' => false,
'ep_mask' => EP_PERMALINK,
),
));
}
} new Types();
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