Hi! Yes, in Business Central, the actual calculation behind realized and unrealized exchange rate gains/losses isn't shown directly in the journal, but you can trace it with these steps:
1. Check the Currency Exchange Rates
Go to Currency Exchange Rates (Search > Currencies > Exchange Rates) to find the rate used on the posting date.
2. Open the Detailed Ledger Entries
For realized gains/losses, go to the Customer/Vendor Ledger Entries, and click Navigate > Entries > Detailed Ledger Entries. This will show the exchange rate differences and the applied amounts.
3. Unrealized Gains/Losses
If it’s unrealized, go to the General Ledger Entries and filter for entries posted with the description like "Unrealized Gain" or "Unrealized Loss", typically posted from the Adjust Exchange Rates batch job.
4. Audit Trail
Use Navigate on the G/L entry to find linked subledger details — invoice, payment, rate used — and re-perform the calculation manually using the original transaction amount and rate vs. adjusted rate.
Unfortunately, BC doesn't store a separate calculation log — you have to reconstruct it using posted entries and rate tables.
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