fix

apps/edr-freight-web/backoffice/src/components/trainBuilder/BuildTrainModal.tsx

@@ -16,7 +16,7 @@ import { useEffect, useState } from "react";
 import { api } from "@/services/api";
 import type { TrainComposition } from "@/services/trainBuilder.service";
 import { useToast } from "@/hooks/use-toast";
-import { EXPORT_TRAIN_OPTIONS, importRunFor } from "@/constants/trainRuns";
+import { IMPORT_TRAIN_OPTIONS, exportRunFor } from "@/constants/trainRuns";
 
 const parseError = (error: unknown, fallback: string) => {
   if (isAxiosError(error)) {
@@ -56,11 +56,11 @@ export default function BuildTrainModal({ opened, onClose, onBuilt }: BuildTrain
     setLocomotiveIds([]);
   }, [yardId]);
 
-  // The import run is fixed by the export run, so it tracks it rather than
-  // being entered by hand (and clears back to empty when the export is cleared).
+  // The export run is fixed by the import run, so it tracks it rather than
+  // being entered by hand (and clears back to empty when the import is cleared).
   useEffect(() => {
-    setImportTrainNumber(importRunFor(exportTrainNumber));
-  }, [exportTrainNumber]);
+    setExportTrainNumber(exportRunFor(importTrainNumber));
+  }, [importTrainNumber]);
 
   useEffect(() => {
     if (!opened) {
@@ -85,7 +85,7 @@ export default function BuildTrainModal({ opened, onClose, onBuilt }: BuildTrain
     // only "nothing picked" is reachable here.
     if (!exportTrainNumber || !importTrainNumber) {
       toast({
-        title: "Pick an export train number (e.g. 8001) — the import run follows it",
+        title: "Pick an import train number (e.g. 8002) — the export run follows it",
         variant: "destructive",
       });
       return;
@@ -138,24 +138,24 @@ export default function BuildTrainModal({ opened, onClose, onBuilt }: BuildTrain
           maxLength={100}
         />
         <Group grow>
-          <Select
+          {/* Fixed by the import run — derived, never typed. */}
+          <TextInput
             label="Export train number"
             description="Odd — Ethiopia → Djibouti runs"
             placeholder="e.g. 8001"
-            data={EXPORT_TRAIN_OPTIONS}
-            value={exportTrainNumber || null}
-            onChange={(value) => setExportTrainNumber(value ?? "")}
-            searchable
-            clearable
+            value={exportTrainNumber}
+            readOnly
+            variant="filled"
           />
-          {/* Fixed by the export run — derived, never typed. */}
-          <TextInput
+          <Select
             label="Import train number"
             description="Even — Djibouti → Ethiopia runs"
             placeholder="e.g. 8002"
-            value={importTrainNumber}
-            readOnly
-            variant="filled"
+            data={IMPORT_TRAIN_OPTIONS}
+            value={importTrainNumber || null}
+            onChange={(value) => setImportTrainNumber(value ?? "")}
+            searchable
+            clearable
           />
         </Group>
         <Select