> ## Documentation Index
> Fetch the complete documentation index at: https://control-dev.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
# Override monthly FX rates
> Replace the default conversion rate for a currency pair and accounting month.
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Use an FX override when group reporting must follow a company-approved monthly rate instead of Control's default market rate.
Open FX Overrides.
## Add an override
1. Choose **Add Row**.
2. Enter the **Balance Month** in `YYYY-MM` format.
3. Set **Base** to the currency you are converting from.
4. Set **To** to the currency you are converting into.
5. Enter the rate as `1 Base = Rate To`.
6. Leave **Also inverse** enabled if Control should also use `1 / Rate` for the reverse pair.
7. Add a note that identifies the approved rate source or reporting policy.
For example, `Base = USD`, `To = NOK`, and `Rate = 10.5000` means `1 USD = 10.5 NOK`. With **Also inverse** enabled, the same row can convert NOK to USD using `1 / 10.5`.
The base currency is required. A rate without an explicit direction is ambiguous and may produce the inverse of the
intended conversion.
## How the month is applied
An override applies to the whole accounting month. Control normalizes the selected month to its month-end date when matching conversions.
Only one direct override can exist for the same month, base currency, and target currency. A separately entered reverse pair is allowed and takes precedence when Control performs that direct reverse conversion.
## Verify the result
After saving an override:
1. Open a group-currency P\&L or Transactions Browser view for the affected month.
2. Compare one known local-currency value with its group-currency value.
3. Confirm the direction with `converted value = local value × rate`.
4. Check Audit Log when you need to confirm who changed the rate. Each event also shows a **Channel** badge (`UI`, `MCP`, `API`, `System`, or `Unknown`) so you can tell whether the change came from a person in the Control UI, an AI workflow over MCP, or another API client. Use the **Channel** filter to narrow the list to a single source. Events recorded before the channel was tracked show `Unknown`.
## Troubleshooting
### The report still uses the old rate
Confirm the month, pair direction, group-currency toggle, and report period. Then reload the report after the override has saved.
### More than one currency pair is involved
Create a separate row for each required direct pair. Do not assume that one override automatically defines unrelated cross-rates.