payment method disapper with currency Switcher

Hi there,
After I enabled the currency switcher, I noticed that in check out page , and If I switch the currency to different to the default one , one method of payment disappear.

For example: I have paypal method and Bank Transfer method.
When I switch the currency from CAD to SR using hikashop currency switcher in checkout page , the paypal payment method disappear while bank transfer still there.
Is there a way that I can keep booth payment method when I use hikashop currency switcher.
Thanks

Thanks nicolas for your response , I understand that SR currency is not supported by paypal . However, The default currency is CAD, and what I meant is that is there is a way that I can only configure SR currency to be appear on the front end, and when a customer chose a paypal method in the checkout, and then click next it will take him/her to paypal website with SR currency converted to CAD the accepted currency in the background.
I have seen this with different websites as a solution to power the payment methods, and I'm wondering if I can do this with Hikashop.
Thanks

Thanks nicolas.
I will try it.

Hi Nicolas,
I was able to get paypal methods shwoing in the checkout page , but when I chose paypal method and click "Next", it does not convert
the SAR Currency to CAD. it shows the same SAR amount in CAD ?
So, I'm wondering if you guys could help me in this, or is there a simple way to make the SAR currency converted after the user click "next" button.
pls see attached file.
Thanks again

Thanks Nicolas for your quick response
I set the rate as you said, but it still takes the same SAR amount in the checkout page to paypal in USD after clicking "Next" without conversion.

Thanks Nicolas,

I have changed the default currency and also tried several thing, and I have conclude that the currency conversion process takes a place only during the checkout process ( I mean when the user hit the "End" Button after adding an item on the shopping cart), it redirects him/her to checkout page with converted currency and a message saying that "the currency you chose is not accepted currency, it will be converted to USD ).However, that's not what I am pointing to.What I am looking for if it is possible to have the conversion step done after the user leaving checkout page when he/she click next to be redirected to paypal.
regards,
power_man

I see , i always like to avoid customization , and love to live with standardization. Howevre, I could live with bank transfer option for right now.

Thanks Nicolas