Error 404 on checkoutpage, SEF is 'on' in Joomla

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.5.20
-- Error-message(debug-mod must be tuned on) -- : Error 404

Hi,

How to configue HikaShop if I have a special checkout menu active "Force a menu on the checkout" ( menu item type = HikaShop, Checkout) and I want the "Search Engine Friendly URLs" = ON in Joomla.

Force a menu on the checkout = "checkout"
Search Engine Friendly URLs = On
gives an 404 error when checking out.

Force a menu on the checkout = none
Search Engine Friendly URLs = On
everything works fine, but the HikaShop Cart module and the HikaShop Content module are visible ( I want them hidden)

Force a menu on the checkout = "checkout"
Search Engine Friendly URLs = Off
everything works fine, the HikaShop Cart module and the HikaShop Content module are hidden, but now there is the long URL : speelgoedfoto.nl/sgf/index.php?option=co...checkout&Itemid=1428 ( I want SEO friendly url's)

Can you help me?

Thanks in advance, Han

Hi Nicolas,

The URL is speelgoedfoto.nl/sgf/kassa/Checkout when both options are active.
SEF url options see screenprint.

More tests :
If I turn off the option 'Activate smaller url' then I don't get the 404 error but get the Categorie Listing view instead of the Checkout view ?!?
If I turn on the option 'Activate smaller url' and remove the Checkout SEF name (empty the field), the checkout view is visible : problem solved !!
Thank you for pointing me in the right direction!

Thanks, Han