I think the usage of the currency starts on the invoice (you may have an invoice of a supplier on diferent currency without having the purchase module). So for me it makes sense to define both fields on the account_invoice module and use them on sale, purchase and other modules.
This is coherent with the payment_term usage.
|2021-04-08 08:39:35||pokoli||set||messageid: <1617863975.1077785.5EV7UWZSDD6JV6NL.firstname.lastname@example.org>|
|2021-04-08 08:39:35||pokoli||set||recipients: + ced, timitos, 2cadz, reviewbot|
|2021-04-08 08:39:35||pokoli||link||issue9305 messages|
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