error 10413 in paypal express

-- url of the page with the problem -- : demo.battleva.co.uk/cubicle
Hikashop 2.3.1 Business
-- Joomla version -- : 3.3
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message

Hi,
I have just started getting this error when trying to checkout with paypal express:
Connection failure - error code : 10413 , error message : The totals of the cart item amounts do not match order amounts

Can you please explain what I need to do to fix .

Thanks

Tony

Hi,
I think I may have found a solution late last night before you got to try. Switching the rounding option on in config seems to get rid of the issue.

Tony

Nicolas,
my solution did not work and we have put the site live and now are unable to place orders, As an example try ordering 10 of the part 13mm channel brackets Tccha13pcb and you will get the error, you can order 1 no problem so it must be some rounding r calculation difference somewhere

This is a real problem as we wnt libe thinking it was ok the the live site is at www.cubiclefittings.com

Thanks

Tony

update:
ok the fix seems to be switch off the send cart option and then it goes through, however the big problem now is the fact that the cart is £66.10 but when you get to paypal it show $66.10 dollars. you can still see the issue with the send to cart switched on at demo.battleva.co.uk/cubicle

upadte2:
The problem with currency and the send cart being switched off is that the currency is not being sent in the array . If you add the line
'PAYMENTREQUEST_0_CURRENCYCODE' => $currency->currency_code,
into the $arayparams = array ( section the problem goes away.

thanks

Tony