IBAN in Othr/Id
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RBS accepts IBAN in (Dbtr/Cdtr)Acct/Id/Othr/Id field.
IBAN validation in this field is triggered when the first two positions of the field start with upper-case letter.
However, it should be noted that (Dbtr/Cdtr)Acct/Id/IBAN is still mandatory for SEPA payments, so giving IBAN in Id/Othr/Id only applies to non-SEPA payment messages.