Comment 6 for bug 523428

if it is necessary/simple to calculate the checksum I am fine to convert
letters to lower case, but the user must see upper case and it must also be
stored in upper case.

Behaviour 2 is correct,
but the user will not enter the blanks - expanding should be done by the
system

what to do is remove existing blanks and regroup using the code in the link

but we have to notify the "payment" code because it needs to remove the blanks
before sending the account to the bank