> currency should be either ^[A-Z]{3}$ or a URL.
@rsolomakhin is that correct?
I would have said it must be ^[A-Z]{3}$ because that is the required format for the default `currencySystem`.
If you want to use anything else you must specify the `currencySystem` and it should not be `urn:iso:std:iso:4217`.
Where do you get "or a URL"?
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