Error message displayed for split distance created in Korean Won currency

[m-natarajan]

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Version Number: 9.0.59-3
Reproducible in staging?: Y
Reproducible in production?: Y
If this was caught on HybridApp, is this reproducible on New Expensify Standalone?:
If this was caught during regression testing, add the test name, ID and link from TestRail:
Email or phone of affected tester (no customers):
Logs: https://stackoverflow.com/c/expensify/questions/4856
Expensify/Expensify Issue URL:
Issue reported by: @jacobkim9881
Slack conversation (hyperlinked to channel name): ts_external_expensify_open_source

Action Performed:

Prerequisite: Default currency in Korean Won

1. Create a group chat
2. Click the + in composer and select split expense
3. Select Distance and enter address for Start and Stop field
4. Click Next

Expected Result:

Amount equally split and user able to click split button to submit the expense

Actual Result:

The sum of splits must equal the total amount error message displayed and split button non functional

Workaround:

Unknown

Platforms:

Which of our officially supported platforms is this issue occurring on?

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

Screenshots/Videos

Add any screenshot/video evidence

2024-11-08.7.14.00.mov

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[melvin-bot]

Triggered auto assignment to @OfstadC (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.

[jacobkim9881]

I found there is a difference between total amount and split shares:

transaction: 
Object
amount: 519357        /////// not rounded
attendees: [Object] (1)
billable: false
category: ""
comment: {waypoints: Object, customUnit: {customUnitRateID: "_FAKE_P2P_ID_", quantity: 4281.895}, isLoading: false}
created: "2024-11-12"
currency: "KRW"
errorFields: {}
iouRequestType: "distance"
isFromGlobalCreate: false
merchant: "4.28 km @ ₩1213.45 / km"
participants: [{accountID: 18602521, selected: true}] (1)
participantsAutoAssigned: true
pendingFields: {}
reportID: "4715962770440927"
routes: {route0: Object}
shouldShowOriginalAmount: false
splitPayerAccountIDs: [18608989] (1)
splitShares: Object
/////////////// rounded here below
18602521: {amount: 259700, isModified: false}
18608989: {amount: 259700, isModified: false}
Object 견본
transactionID: "1"

App/src/pages/iou/request/step/IOURequestStepDistance.tsx

Lines 144 to 153 in 64cb4ee

	const {unit, rate} = mileageRate ?? {};
	const distance = TransactionUtils.getDistanceInMeters(transaction, unit);
	const currency = mileageRate?.currency ?? policyCurrency;
	const amount = DistanceRequestUtils.getDistanceRequestAmount(distance, unit ?? CONST.CUSTOM_UNITS.DISTANCE_UNIT_MILES, rate ?? 0);
	IOU.setMoneyRequestAmount(transactionID, amount, currency);
	const participantAccountIDs: number[] | undefined = participants?.map((participant) => Number(participant.accountID ?? -1));
	if (isSplitRequest && amount && currency && !isPolicyExpenseChat) {
	IOU.setSplitShares(transaction, amount, currency ?? '', participantAccountIDs ?? []);
	}

There is code for decision how the total is same with split shares. I tried to round total amount from 519357 to 519400. For this calculation, round method is needed but needed parameter currency above always be undefined. Why mileageRate?.currency, policyCurrency are undefined? I am tracing the reason.

[mkzie2]

Proposal

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

The sum of splits must equal the total amount error message displayed and split button non functional

What is the root cause of that problem?

The total amount is calculated by calculateAmount function

App/src/libs/actions/IOU.ts

Line 7661 in 64cb4ee

const splitAmount = IOUUtils.calculateAmount(participantsLength, amount, currency, isPayer);

The total amount of the split bill is rounded before we calculate the split amount

App/src/libs/IOUUtils.ts

Line 51 in 64cb4ee

const totalInCurrencySubunit = Math.round((total / 100) * currencyUnit);

then if the rounded total amount is different from the current amount, the error appears here

App/src/components/MoneyRequestConfirmationList.tsx

Lines 452 to 454 in 64cb4ee

	if (sumOfShares !== iouAmount) {
	setFormError('iou.error.invalidSplit');
	return;

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

When calculating the split amount, we should remove the Math.round here so that we do not round the total amount but only the split amount.

const totalInCurrencySubunit = (total / 100) * currencyUnit;

App/src/libs/IOUUtils.ts

Line 51 in 64cb4ee

const totalInCurrencySubunit = Math.round((total / 100) * currencyUnit);

What alternative solutions did you explore? (Optional)

[OfstadC]

Can confirm

But this only happens for this currency - I tried two other currencies and did not get the same response. So not sure how high priority this will be. It's likely uncommon to split a mileage expense, and this would only affect a subset of users

[mkzie2]

@OfstadC This bug also happens for some other currencies like VND.

[OfstadC]

Added to Quality and posted in Slack for prioritization

[tgolen]

Does this only affect distance expenses, or does it happen to any split?

[mkzie2]

This only affects distance expense, the reason is the rate is odd.

[OfstadC]

Will test this a bit more first thing tomorrow morning - had a managed customer issue that threw my day off today 😓