Fix: Prevent changing currency on unreported distance expenses

[nyomanjyotisa]

Explanation of Change

Prevent the user from changing the currency on unreported distance expenses

Fixed Issues

$ #74894
PROPOSAL: #74894 (comment)

Tests

Same as QA Steps

• Verify that no errors appear in the JS console

Offline tests

Same as QA Steps

QA Steps

1. Create a Track distance to self DM.
2. Go to the created expense.
3. Click on the “Amount” field.
4. Verify that the currency field is not present.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
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Screenshots/Videos

Android: Native

Android-Native.mp4

Android: mWeb Chrome

Android-mWeb.Chrome.mp4

iOS: Native

iOS-Native.mp4

iOS: mWeb Safari

iOS-mWeb.Safari.mp4

MacOS: Chrome / Safari

MacOS-Chrome.mp4

[codecov]

Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines	Coverage Δ
src/libs/TransactionUtils/index.ts	71.34% <100.00%> (+0.06%)	⬆️
...rc/pages/iou/request/step/IOURequestStepAmount.tsx	14.85% <0.00%> (-0.15%)	⬇️
... and 9 files with indirect coverage changes

[melvin-bot]

@eVoloshchak Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[trjExpensify]

I'm not convinced this is how we should be solving the bug report.

On Classic, you can't change the currency of a distance expense created, whether that's reported on a workspace or unreported. You can change the amount, but not the currency.

So I'm thinking we should do the same with unreported expenses on NewDot too, and not allow changing the currency of an unreported distance expense. CC: @Expensify/product-pr @cristipaval

[nyomanjyotisa]

Waiting for the product review decision

[cristipaval]

@trjExpensify, should I add this as a requirement in the issue related to distance requests from the Unreported project?

[trjExpensify]

Yeah, if you think that's best... or have this PR updated to focus on disabling currency on unreported distance expenses.

[cristipaval]

let's focus this one on disabling the currency, since our PR is already in review. I'll inform the contributors on our PR about this one. cc @dangrous

[nyomanjyotisa]

PR updated!
cc @eVoloshchak

[eVoloshchak]

@nyomanjyotisa, could you merge the latest main please? Looks like there are some conflicts

[nyomanjyotisa]

@eVoloshchak I've merged with the latest main

[eVoloshchak]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
• I verified the correct issue is linked in the ### Fixed Issues section above
• I verified testing steps are clear and they cover the changes made in this PR
  • I verified the steps for local testing are in the Tests section
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  • I verified the steps cover any possible failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
• I checked that screenshots or videos are included for tests on all platforms
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• If there are any errors in the console that are unrelated to this PR, I either fixed them (preferred) or linked to where I reported them in Slack
• I verified there are no new alerts related to the canBeMissing param for useOnyx
• I verified proper code patterns were followed (see Reviewing the code)
  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick).
  • I verified that comments were added to code that is not self explanatory
  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
  • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
  • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
  • I verified proper file naming conventions were followed for any new files or renamed files. All non-platform specific files are named after what they export and are not named "index.js". All platform-specific files are named for the platform the code supports as outlined in the README.
  • I verified the JSDocs style guidelines (in STYLE.md) were followed
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Screenshots/Videos

Android: HybridApp

Screen.Recording.2025-12-08.at.22.30.30.mov

Android: mWeb Chrome

Screen.Recording.2025-12-08.at.22.31.27.mov

iOS: HybridApp

Screen.Recording.2025-12-08.at.22.34.17.mov

iOS: mWeb Safari

Screen.Recording.2025-12-08.at.22.32.26.mov

MacOS: Chrome / Safari

Screen.Recording.2025-12-08.at.22.28.33.mov

[eVoloshchak]

LGTM!

[dangrous]

Can we just combine these two conditionals, so something like

if (
(policy?.customUnits && !isUnreportedAndHasInvalidDistanceRateTransaction(transaction, policy))
|| (!transaction?.modifiedMerchant && transaction?.modifiedCurrency)
) {

They come out the same, right?

[nyomanjyotisa]

Yeah, we can do that. PR updated!

[dangrous]

@trjExpensify or @heyjennahay do you want to take a look before we merge?

[heyjennahay]

Going to let @trjExpensify take this one

[trjExpensify]

Thanks for making the update!

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