Hi, The Ledger page contains controls and defines the currency used when posting transactions to the general ledger. You must specify the accounting currency (that is, the currency used in the General Ledger Accounting Currency column for all documents.) You can also view the Configuring Ledger Currency section of this article for more information. Configure ledgers - Finance | Dynamics 365 | Microsoft Learn
Can you please check if you have setup the ledger?
General LEdger-> Setup->Ledger
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