Error in custon order fields in checkout page

-- HikaShop version -- : 2.6.0 Business
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.5.29
-- Error-message(debug-mod must be tuned on) -- : Error

Please complete the nome del bambino field

Please complete the informazioni sull'evento field

Please complete the indica qui font e colore scelti e qualsiasi comunicazione aggiuntiva. Scegli i colori e gli accessori ti manderemo una foto campione del confezionamento prima di procedere! field

Hi everybody,
I have some custom fields per every category product and I display them in checkout page but when I click on "finish" button it's return me that error (Please complete the nome del bambino field, ecc.). These field are required in another product category...
I read and tried the solutions you proposed to other users but nothing works for me...

Onother question... I would like to change the layout of the blocks on the checkout page, what file I have to edit?
thanks and best regards,
Loredana

(where can I give you user and password?)

Hi Nicolas,
thank you!
But... I have anothe request... I would like to change the layout of the blocks on the checkout page, what file I have to edit?
thanks and best regards,
Loredana

Hello Loredana,
The solution will be :
- To directly edit the files of the view "Checkout" of your front-end template via "Hikashop->Display->Views"
Or
- To use some CSS code to adapt the display : www.hikashop.com/support/support/documen...the-display.html#css

Thanks Mohamed!
I already try to edit all files in "Checkout" but i didn't find what file displays blocks order.
Now my order is: Billing Address - Payment method - Checkout Coupon - Checkout Cart - Additional information
But... I would like to change in: Checkout Cart - Additional information - Payment method - Billing Address - Checkout Coupon

What file have I to edit?

Best regards,
Loredana