MTN91: (3) Field 32B: Currency Code, Amount
This field specifies the currency and amount, that is, charges, interest or other expenses, claimed by the Sender.
NETWORK VALIDATED RULES
Currency must be a valid ISO 4217 currency code.
The integer part of Amount must contain at least one digit. A decimal comma is mandatory and is included in the maximum length. The number of digits following the comma must not exceed the maximum allowed for the specified currency.