fix: per diem from report preview lands on workspace chat

[MobileMage]

Explanation of Change

Creating a Per Diem expense from a report preview's Add expense menu was opening the resulting expense report after submission, instead of leaving the user in the workspace chat (the screen they started from). This differed from Manual, Scan, and Distance, which all correctly stay in the workspace chat.

It's caused when the per-diem flow is launched from a report preview, backToReport (the workspace chat ID) is set on the parent route but gets dropped by the per-diem intermediate step screens (STEP_DESTINATION, STEP_TIME, STEP_SUBRATE don't carry it). By the time IOURequestStepConfirmation renders, backToReport is undefined, so the pre-insert destination (destinationReportID) falls back to report?.reportID — the expense report — and the SubmitExpenseOrchestrator reveals that route on submit.

To fix we align destinationReportID in IOURequestStepConfirmation.tsx with the same "where is the user actually viewing right now" logic that useExpenseSubmission.submitPerDiemExpense already uses for its activeReportID. When backToReport is missing and report is an expense/IOU/invoice report that the user is not currently viewing, fall back to its parent chat (report.chatReportID) instead of the expense report itself. When the user is viewing the expense report, keep the existing behavior (stay on it).

Also kept the matching backToReport ?? activeReportID change in useExpenseSubmission.ts so the slow-path navigation honors backToReport too, consistent with requestMoney / createDistanceRequest.

Fixed Issues

$ #91093
PROPOSAL: #91093 (comment)

Tests

Precondition — give a workspace per diem rates:

1. Sign in as a workspace admin on a Control / Corporate workspace (or create one — per diem is a Control-tier feature).
2. Workspace settings → More features → enable Per diem under Spend.
3. Open the new Per diem row → Import per diem rates → upload a CSV with at least one rate (destination, subRate, amount, currency).

Repro:

1. From the LHN, open the workspace chat for that workspace (the policy expense chat, not #admins).
2. In the composer, tap + → Create report → submit to create an empty expense report; a report preview card appears in the chat.
3. On the preview card, tap Add expense → Create expense → Per diem.
4. Pick a destination → subrate → date → tap Submit.
5. Verify the app stays on the workspace chat, with the report preview updated to include the new per-diem expense (matching the behavior of Manual / Scan / Distance from the same entry point).
6. Verify the app does not navigate into the expense report.
7. Repeat steps 2–4 but with Manual, Scan, and Distance to confirm no regression — each should still land on the workspace chat.
8. While viewing the expense report directly (open it from the preview), submit another per-diem expense to that report and verify the app stays on the expense report (i.e., the topmost-report check still keeps users where they were).

• Verify that no errors appear in the JS console

Offline tests

Same as Tests, performed while offline:

1. Go offline.
2. Repro steps 1–5 above.
3. Verify the per-diem expense is created optimistically and the app stays on the workspace chat.
4. Reconnect and verify the expense persists with no errors.

QA Steps

Same as Tests.

• 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)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
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  • Android: mWeb Chrome
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Screenshots/Videos

Android: Native

Kapture.2026-05-21.at.07.40.16.mp4

Android: mWeb Chrome

iOS: Native

Kapture.2026-05-21.at.07.04.20.mp4

iOS: mWeb Safari

MacOS: Chrome / Safari

Kapture.2026-05-21.at.06.52.40.mp4

[melvin-bot]

@brunovjk 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]

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Align pending-new flag with overridden destination report

When backToReport is provided, this call now navigates using backToReport ?? activeReportID, but shouldAddPendingNewTransactionIDs is still computed from the pre-override activeReportID. In cases where backToReport overrides the destination, the app can open the overridden report without adding the pending transaction marker for that report, so the new expense may not be highlighted/treated as new in the destination report preview state.

Useful? React with 👍 / 👎.

[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
...es/iou/request/step/IOURequestStepConfirmation.tsx	66.77% <100.00%> (+0.10%)	⬆️
.../request/step/confirmation/useExpenseSubmission.ts	53.30% <0.00%> (-0.24%)	⬇️
... and 72 files with indirect coverage changes

[joekaufmanexpensify]

Makes sense 👍

[brunovjk]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

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[brunovjk]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
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  • 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
• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
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Screenshots/Videos

Android: HybridApp

Android: mWeb Chrome

iOS: HybridApp

iOS: mWeb Safari

MacOS: Chrome / Safari

Screen.Recording.2026-05-26.at.20.29.25.mov