Cannot create hook_menu subitems with proper position in administrative menu
I think the MENU_LOCAL_ACTION type for your sub-menus is not the good choice.

The Menu item types documentation tell us :


  MENU_LOCAL_ACTION : Menu type -- An action specific to the parent,
  usually rendered as a link.


If you want to have a menu with sub-menus, you need to also define a page call back for it. You can use the system_admin_menu_block_page, witch display a bloc with all the sub-menus links.

// Main menu link
$items['admin/store/products-fabrics'] = array(
    'title' =&gt; 'Látky produktov',
    'page callback' =&gt; 'system_admin_menu_block_page',
    'access arguments' =&gt; array('access administration pages'),
    'file' =&gt; 'system.admin.inc',
    'file path' =&gt; drupal_get_path('module', 'system'),
    'type' =&gt; MENU_NORMAL_ITEM,
);

// Sub menu links
$items['admin/store/products-fabrics/'.$product['nid']] = array(
    'title' =&gt; $product['title'],
    'access arguments' =&gt; array('access administration menu'),
    'page callback' =&gt; 'drupal_get_form',
    'page arguments' =&gt; array('activit_eshop_fabrics_of_products_form'),
    'type' =&gt; MENU_NORMAL_ITEM,
    'file' =&gt; 'd_forms.inc',
);