Merge pull request Expensify#54654 from Expensify/alberto-negative

Correctly handle negative numbers for per diem rates

Author: deetergp

src/libs/MoneyRequestUtils.ts

@@ -50,6 +50,9 @@ function validateAmount(amount: string, decimals: number, amountMaxLength: numbe
             ? `^${shouldAllowNegative ? '-?' : ''}\\d{1,${amountMaxLength}}$` // Don't allow decimal point if decimals === 0
             : `^${shouldAllowNegative ? '-?' : ''}\\d{1,${amountMaxLength}}(\\.\\d{0,${decimals}})?$`; // Allow the decimal point and the desired number of digits after the point
     const decimalNumberRegex = new RegExp(regexString, 'i');
+    if (shouldAllowNegative) {
+        return amount === '' || amount === '-' || decimalNumberRegex.test(amount);
+    }
     return amount === '' || decimalNumberRegex.test(amount);
 }
 

src/pages/workspace/perDiem/EditPerDiemAmountPage.tsx

@@ -48,8 +48,7 @@ function EditPerDiemAmountPage({route}: EditPerDiemAmountPageProps) {
 
             const newAmount = values.amount.trim();
             const backendAmount = newAmount ? convertToBackendAmount(Number(newAmount)) : 0;
-
-            if (backendAmount === 0) {
+            if (backendAmount === 0 || newAmount === '-') {
                 errors.amount = translate('common.error.fieldRequired');
             }