Customer/Bank/Vendor/Fixed Assets transactions in Secondary Currency like a ledger transactions

I really need to get the secondary amount for Customer transactions. Is that possible? My IT support technician says no, but I’d like to hear another opinions. Voucher number is not a unique code per line. Customer transactions record ID is different from Ledger transactions one (because they belong to different tables). So, I don’t know how I could get a secondary currency amount for a Customer (also Bank, Fixed Asset or Vendor) transactions for each line.

Can I add the field “Secondary Currency amount” in Customer (Bank/Vendor/Fixed Assets) transactions?

I’m sorry for my English.

Thank you in advance for your help.