Problem with external URL menu items

[Szarlus]

Hi I have a problem with creating menu items of type External URL.

I wished to put there a relative link to manufacturer's products.

When I write in the link text box something like this: "index.php/shop/manufacturer/my_manufacturer?orderby=product_in_stock&order=DESC" it works, but only if I click the link from my main site. If I do it from any othe page it redirects me to "index.php/shop" page.
I guess what it does is that it simply appens my relative url to my current page's url and when I am on any other than base page it can't point existing page so it goes to /shop.
If I am correct, is there a way, other than writing absolute url to make VM just use my relative link the way I want it?

Thanks in advance.

Joomla! 3.4.8
VirtueMart 3.0.9

[PRO]

have you tried a /   in the front?

[GJC Web Design]

also why in this case would an absolute url hurt?