The Dynamics Explorer tackles an error on the posting journals when trying to post both Receivables and Payables Transactions. “This transaction contains multi-currency error(s)”
— Read more on thedynamicsexplorer.com/2019/08/14/dynamics-gp-error-this-transaction-contains-multi-currency-errors-and-cant-be-posted-when-posting-multi-currency-transactions/
Dynamics GP – Error “This transaction contains multi – currency errors and can’t be posted” when posting Multi Currency Transactions – The Dynamics Explorer
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Archived post from 2019. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.