Payment method: Purchase order unable to complete

-- HikaShop version -- : 2.5.0 and 2.4.0
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.3.10
-- Error-message(debug-mod must be tuned on) -- : Please enter a Purchase Order Number

Hi!

I'm having a strange issue with the Purchase order payment method, I have managed to replicate the issue in the 2.4.0 and 2.5.0 version of hikashop.

We have a 1 page checkout and when a registered user attempts to buy a product using the "Purchase order" payment method the checkout page submits and throws the "Please enter a Purchase Order Number" error despite the number being entered, this keeps happening no matter how many times one try to submit the order (with the Purchase order number entered into the field).

I did some digging trying to figure it out and it seems that there is stored two of these on submit, one with the "purchase order number" and one without.

------WebKitFormBoundaryx4MchUHu0EoX8dYx
Content-Disposition: form-data; name="hikashop_purchase_order_number"

12355
------WebKitFormBoundaryx4MchUHu0EoX8dYx
Content-Disposition: form-data; name="hikashop_purchase_order_number"

Hi Nicolas.

Seems it was the issue of having two "Purchase orders" methods at the same time

It makes sense that it would be a duplicate input field.

Thanks for the help!