Re: [ubl-dev] The meaning of the currency fields in an invoice

["G. Ken Holman" <g.ken.holman@gmail.com>]

Top-level currency code BBIEs are helpful when printing UBL 
documents. Often there is such a value exposed on the page indicating 
the currency.

I wouldn't expect anyone to override an amount's currency attribute 
with a top-level currency code in its stead.

I think it is merely a convenience for the document reader, and my 
first thought is that I would agree they could be ignored by a 
processing system when reading the document. But if the processing 
system is tied to a single currency it would be a courtesy to reflect 
it when creating the document.

I think the use of the word "default" in the definition of, say, 
"Invoice. Document_ Currency Code. Code" could be misleading, as 
there are no amounts with absent currency indications.

I could imagine a user community stating that the top-level coded 
value reflect the value used in the monetary totals, though, again, 
it would be only as a convenience for the recipient.

An interesting observation, David, thank you.

. . . . . Ken

At 2018-12-12 13:02 +0000, David Goodenough wrote:

> On a paper invoice it is not uncommon to find unqualified numbers, 
> no units or denominations and the reader has to guess what they 
> mean. This leads to confusion and is a Bad Thing(TM).
>
>
>
> In UBL, quite correctly, all numbers that are not simply counts have 
> units/denominations, so we always know what they mean. And for the 
> avoidance of doubt the currencyID in an Amount object is required. 
> And the list from which these currencyIDs are drawn is defined in 
> the Amount object definition as being UN/ECE Rec9.
>
>
>
> Even the PaymentMeans/PayeeFinancialAccount has a currency code 
> built into it so we know what currency the payment should be made in.
>
>
>
> So what would it mean if any of the ???CurrencyCode fields in an 
> Invoice were set. If they are the same as the relevant 
> Amount/currencyId values then they are at best redundant, but what 
> would/could it mean is they were different? And if they were 
> different which has priority?
>
>
>
> In short, I suppose what I am asking is if these ???CurrencyCode 
> fields have any possible meaning and if not if they should simply be 
> not specified when building UBL objects and ignored when reading them.
>
>
>
> David


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