Merge pull request #82281 from callstack-internal/fix/82267-per-diem-navigation-issues

[CP Staging] Fix per diem navigation issues

(cherry picked from commit fc97cfc)

(cherry-picked to staging by lakchote)

Author: cristipaval

src/pages/iou/request/step/IOURequestStepDestination.tsx

@@ -20,7 +20,7 @@ import useThemeStyles from '@hooks/useThemeStyles';
 import {fetchPerDiemRates} from '@libs/actions/Policy/PerDiem';
 import {setTransactionReport} from '@libs/actions/Transaction';
 import Navigation from '@libs/Navigation/Navigation';
-import {getPerDiemCustomUnit, isPolicyAdmin} from '@libs/PolicyUtils';
+import {getPerDiemCustomUnit, getPolicyByCustomUnitID, isPolicyAdmin} from '@libs/PolicyUtils';
 import {findSelfDMReportID, getPolicyExpenseChat} from '@libs/ReportUtils';
 import {shouldRestrictUserBillableActions} from '@libs/SubscriptionUtils';
 import variables from '@styles/variables';
@@ -67,7 +67,12 @@ function IOURequestStepDestination({
     explicitPolicyID,
     ref,
 }: IOURequestStepDestinationProps) {
-    const [policy, policyMetadata] = useOnyx(`${ONYXKEYS.COLLECTION.POLICY}${explicitPolicyID ?? getIOURequestPolicyID(transaction, report)}`, {canBeMissing: false});
+    const [allPolicies] = useOnyx(ONYXKEYS.COLLECTION.POLICY, {canBeMissing: true});
+    const reportPolicyID = getIOURequestPolicyID(transaction, report);
+    const policyID = reportPolicyID === CONST.POLICY.ID_FAKE ? getPolicyByCustomUnitID(transaction, allPolicies)?.id : reportPolicyID;
+    const [policy, policyMetadata] = useOnyx(`${ONYXKEYS.COLLECTION.POLICY}${explicitPolicyID ?? policyID}`, {
+        canBeMissing: false,
+    });
     const {accountID} = useCurrentUserPersonalDetails();
     const policyExpenseReport = policy?.id ? getPolicyExpenseChat(accountID, policy.id) : undefined;
     const {top} = useSafeAreaInsets();