Exchange-Rate Snapshot
An exchange-rate snapshot preserves the rate, direction, source and effective time used for a particular calculation. Keeping it with an accepted document prevents later rate changes from silently rewriting history.
A worked example
A practical example to make the concept clear.
| Step | Illustrative record and result |
|---|---|
| Starting record | Quote Q-DEMO-FX on 2 October 2026: source amount 100 USD, target IQD, example rate 1 USD → 1,300 IQD. |
| Change or calculation | Store the rate direction, date and source label “example exercise”; quoted result is 130,000 IQD. |
| Meaning and exception | On 3 October the exercise rate changes to 1,310. A new calculation is 131,000 IQD; Q-DEMO-FX retains its 130,000 snapshot. No live or official rate is represented. |
Why it matters
A saved calculation needs its own amount, rate direction, date and source so later changes can be understood. Preserving the commercial calculation is separate from any accounting revaluation or settlement adjustment.
Make it practical
Can a historic document be regenerated unchanged after a later FX update? Test the answer with the exact release and application package under consideration. Explore Datrylo applications.