Adding node fields programmatically

Hello,
I created a module to provide a content type and several fields (text) for that content type.
The content type's purpose is to hold values that is parsed from a feed.
After creating the content type en fields the node is working good when I use the Fields UI to create a new node. I can enter en edit all data and all is desplayed properly.

However, when I create the node trough coding, the parsed data does not appear in the node object.
Strange thing is that the $node-> title and $node-> body, which are both also parsed from the feed, works good. Only the other field fail.

Here's the code:

function my_function_fill_nodes($id, $item_to_save, $web_page) {
  // code removed - XPAT retrieving node details
 
  $node = new stdClass();
  $node-> type = 'ysm';
  $node-> internal_id = $id; // TODO
  $node-> title = $object_title;
  $node->language = 'en';
  node_object_prepare($node);
  foreach (XXXXXXXXXXXXXXX) {  // parsing a DOM object
    switch(XXXXXXXXXXXXXX) {
      case 'A' :
        $node-> price[$node-> language][0]['value'] = $retrieved_value; 
        break;
      case 'B' :
        $node-> model[$node->language][0]['value'] = $retrieved_value; 
		break;

		// this goes on for 10 items
      default:

	    echo($retrieved_value . '| not matched<br />');
    }
  }
  // seperate code parsing the body text ($body_text)

  // Save all parsed info as a node
  $node->body[$node->language][0]['value']   = $body_text;
  $node->body[$node->language][0]['summary'] = text_summary($body_text);
  $node->body[$node->language][0]['format']  = 1;
  node_save($node);
}

I have already triede to exclude certain things. I have done several dumps of the $node Object, and it always appears correctly, so with the prsed data. But the field values doesn't find their way to the DB.
I have been looking at the code for several days now, so maybe someone can have a quick look for me, as different eyes sees different things,
Thanks!