Expense - Total amount and pay button reload each time any field other than amount is edited

[mitarachim]

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Version Number: 9.1.7-0
Reproducible in staging?: Yes
Reproducible in production?: Yes
If this was caught on HybridApp, is this reproducible on New Expensify Standalone?: N/A
If this was caught during regression testing, add the test name, ID and link from TestRail: Exp
Email or phone of affected tester (no customers): [email protected]
Issue reported by: Applause Internal Team
Device used: Mac 15.0 / Chrome
App Component: Money Requests

Action Performed:

Precondition:

• Delayed submissions and Add approval are disabled
• Workspace has no unsettled expense.

1. Go to staging.new.expensify.com
2. Go to workspace chat
3. Submit a manual expense with currency that is not the default workspace currency.
4. Go to expense report.
5. Click any field other than Amount (description, merchant or date).
6. Edit the amount and save it.

Expected Result:

Total amount and pay button will not reload each time any field other than amount is edited because amount is not modified.

Actual Result:

Total amount and pay button reload each time any field other than amount is edited.

Workaround:

Unknown

Platforms:

• Android: Standalone
• Android: HybridApp
• Android: mWeb Chrome
• iOS: Standalone
• iOS: HybridApp
• iOS: mWeb Safari
• MacOS: Chrome / Safari
• MacOS: Desktop

Screenshots/Videos

Bug6755962_1740644030293.20250227_161224.mp4

View all open jobs on GitHub

[melvin-bot]

Triggered auto assignment to @kadiealexander (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details. Please add this bug to a GH project, as outlined in the SO.

[daledah]

Proposal

Please re-state the problem that we are trying to solve in this issue.

Total amount and pay button reload each time any field other than amount is edited.

What is the root cause of that problem?

When we update the description or date, ... we will get the calculatedDiffAmount

App/src/libs/actions/IOU.ts

Lines 3486 to 3487 in 0856182

	const calculatedDiffAmount = calculateDiffAmount(iouReport, updatedTransaction, transaction);
	// If calculatedDiffAmount is null it means we cannot calculate the new iou report total from front-end due to currency differences.

calculatedDiffAmount is null in this case because the currency is different from iouReport's currency

App/src/libs/actions/IOU.ts

Line 3341 in 0856182

if (updatedCurrency === iouReport.currency && currentCurrency === iouReport.currency) {

So isTotalIndeterministic is true

then we add pendingFields for total

App/src/libs/actions/IOU.ts

Line 3527 in 0856182

value: {...updatedMoneyRequestReport, ...(isTotalIndeterministic && {pendingFields: {total: CONST.RED_BRICK_ROAD_PENDING_ACTION.UPDATE}})},

If the total is pending we'll show the loading indicator

What changes do you think we should make in order to solve the problem?

We should update calculateDiffAmount function to check updatedCurrency === currentCurrency && currentAmount == updatedAmount then return 0

if (updatedCurrency === currentCurrency && currentAmount == updatedAmount){
        return 0
    }

What specific scenarios should we cover in automated tests to prevent reintroducing this issue in the future?

Write test for calculateDiffAmount to cover:

1. Different currency
2. Different amount
3. Same currency
4. Same amount

What alternative solutions did you explore? (Optional)

Reminder: Please use plain English, be brief and avoid jargon. Feel free to use images, charts or pseudo-code if necessary. Do not post large multi-line diffs or write walls of text. Do not create PRs unless you have been hired for this job.