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Manual Exchange Rate Ignored and Recalculated Incorrectly in GJ Posting (BC v27.0 Cloud)

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Posted on by CU17110706-0

Hi Microsoft Experts,

I’m experiencing a strange behavior with currency conversion in Business Central Cloud v27.0 when posting General Journal lines that use a manually entered exchange rate.

① Manual rate ignored after posting

When I open General Journal and click Change Exchange Rate, I manually adjust the Exchange Rate / Currency Factor before posting the document.

However, after posting:

The system still reads the rate from Currency Exchange Rate (Table 330) instead of using my manual value.

In G/L Entries (Table 17), the Source Currency Amount differs from the amount that should have been calculated with the manual rate.

Meanwhile, the Amount (LCY) appears correct, suggesting the rate is reapplied from standard setup, not from the journal line.

② Using a modified rate in Table 330 produces a small calculation drift

To double‑check, I even entered the same rate manually inside Currency Exchange Rate (Table 330) before posting.

While the system then accepts the rate from the table, the calculated LCY and source amounts still show a minor discrepancy — as if Business Central recalculates the amount again during posting using a rounded factor, not the exact journal or table rate.

Summary

Environment: BC Cloud v27.1 (Production)

Expected behavior: When the user adjusts a manual exchange rate on the General Journal, posting should preserve that factor and apply it exactly.

Current result: Rate is disregarded or recalculated using table values, causing a mismatch between Source Currency Amount and input Amount.

Could you confirm if this is a known issue in v27.1 or if a fix is planned for the upcoming cumulative update (e.g. 27.2)?

Thank you in advance for your investigation.

Categories:

Dynamics 365 Business Central

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OussamaSabbouh 11,500 Super User 2026 Season 1 on at

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Hello,

In BC 27.1 the system does not keep the manual exchange rate you enter in General Journal → Change Exchange Rate.
During posting, BC recalculates using the Currency Exchange Rate table and its own rounded factor, so the Source Currency Amount won’t match your manual rate.
This is expected behavior and not a documented 27.1 bug.
A fix is not announced; most partners workaround it by updating Table 330 first or customizing the posting code.

Regards,
Oussama Sabbouh

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Gerardo Rentería Ga... 25,547 Most Valuable Professional on at

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Hi

Have you tested this in a "clean" company, with the company Cronus, for example?

Best

GR

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Pallavi Phade 5,391 Super User 2026 Season 1 on at

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Namaste @CU17110706-0

Currency Exchange rate gets updated as per Manual entry in Journal . I tried and tested its working fine

LEts say for AUD below is exchange RAte against INR

2 AUD is amount used in Transaction .

I changed exchange rate as 100 to 200

Preview Posting

It has considered manual exchange Rate

Regards

Pallavi Phade

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Jainam M. Kothari 15,684 Super User 2026 Season 1 on at

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Hello,

In Business Central v27.1, there’s a reported issue where manually entered exchange rates in the General Journal are ignored during posting—the system reverts to the rate from Currency Exchange Rate (Table 330), causing mismatches between Source Currency Amount and the expected calculation.

Even updating Table 330 directly can lead to minor discrepancies due to rounding logic during posting. This appears to be a known bug under investigation, with no confirmed fix yet in v27.1 or official mention for v27.2.

The best approach is to log the issue with Microsoft Support and monitor upcoming cumulative updates for resolution.

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Rishabh Kanaskar 6,215 Super User 2026 Season 1 on at

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Hi,

This is not a bug but a design change in v27. The system now recalculates the source currency amount using the Currency Exchange Rate table for the posting date, ignoring the manually entered rate for display purposes in some views. If you want Microsoft to review, raise a support ticket or submit feedback on Business Central Ideas.

Thanks

Rishabh

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