En la ficha del producto se habilita la visualización de los movimientos de inventario.

add_action('woocommerce_product_before_set_stock', 'nwp_historial_stock_superior');
add_action('woocommerce_variation_before_set_stock', 'nwp_historial_stock_superior');
function nwp_historial_stock_superior($product)
{
    $stock_history = get_post_meta($product->get_id() , '_stock_history', true) ? get_post_meta($product->get_id() , '_stock_history', true) : array();
    $stock_history[time() ] = (int)get_post_meta($product->get_id() , '_stock', true);
    update_post_meta($product->get_id() , '_stock_history', $stock_history);
}
add_action('add_meta_boxes', 'nwp_caja_meta_historial_stock');
function nwp_caja_meta_historial_stock()
{
    add_meta_box('stock_history', 'Historial de inventario', 'nwp_mostrar_historial_stock', 'product', 'advanced', 'high');
}
function nwp_mostrar_historial_stock()
{
    global $post;
    $product = wc_get_product($post->ID);
    if ($product->get_type() == 'variable')
    {
        foreach ($product->get_available_variations() as $key)
        {
            $products[] = $key['variation_id'];
        }
    }
    else $products[] = $post->ID;
    foreach ($products as $product_id)
    {
        $product = wc_get_product($product_id);
        echo '<h3>' . $product->get_name() . '</h3>';
        $stock_history = get_post_meta($product_id, '_stock_history', true);
        if ($stock_history)
        {
            foreach ($stock_history as $timestamp => $stockvalue)
            {
                if (!$stockvalue) continue;
                echo '<p>' . date(DATE_COOKIE, $timestamp) . ': <b>' . $stockvalue . '</b></p>';
            }
        };
        echo '<p>Existencias actuales: <b>' . $product->get_stock_quantity() . '</b></p>';
    }
}