diff --git a/src/app/projects/[projectId]/revit/page.tsx b/src/app/projects/[projectId]/revit/page.tsx
index fc8b85e..46c3d5d 100644
--- a/src/app/projects/[projectId]/revit/page.tsx
+++ b/src/app/projects/[projectId]/revit/page.tsx
@@ -45,7 +45,7 @@ export default function RevitPage() {
     {error ? <div className="alert alert-danger">{error}</div> : null}
     <div className="row g-3 mt-1"><div className="col-md-6"><section className="card h-100"><div className="card-body"><FileSpreadsheet className="mb-3" size={28} /><h2 className="h5">XLSX-Konfiguration</h2><p className="text-secondary">{snapshot ? "Die Linear-Spalten und das Tabellenlayout sind konfiguriert." : "Noch keine XLSX-Konfiguration gespeichert."}</p><span className={`badge ${snapshot ? "text-bg-success" : "text-bg-secondary"}`}>{snapshot ? "Konfiguriert" : "Offen"}</span></div></section></div><div className="col-md-6"><section className="card h-100"><div className="card-body"><h2 className="h5">Importstatus</h2>{importStatus?.imported ? <><p className="mb-1"><strong>{importStatus.objectCount} Revit-Objekte</strong>{importStatus.fileName ? ` aus ${importStatus.fileName}` : ""}</p><p className="text-secondary mb-0">Quelle: {importStatus.sourceName}</p></> : <p className="text-secondary mb-0">Noch kein Linear-XLSX-Import vorhanden.</p>}</div></section></div></div>
     {importStatus?.imported ? <RevitObjectTable projectId={projectId} onRevision={(revision) => setProject((current) => current ? { ...current, currentRevision: revision } : current)} /> : null}
-    {settingsOpen ? <RevitXlsxSettingsModal configuration={snapshot?.configuration ?? createDefaultRevitXlsxConfiguration()} isSaving={saving} onClose={() => setSettingsOpen(false)} onInspectSample={async (file, configuration) => { const result = await detectExternalModelWorkbook(projectId, file, configuration); return `Muster erkannt: ${result.sheetName}, ${result.columnCount} Spalten, ${result.objectCount} Objekte.`; }} onSave={save} /> : null}
+    {settingsOpen ? <RevitXlsxSettingsModal configuration={snapshot?.configuration ?? createDefaultRevitXlsxConfiguration()} isNewConfiguration={snapshot === null} isSaving={saving} onClose={() => setSettingsOpen(false)} onInspectSample={async (file, configuration) => { const result = await detectExternalModelWorkbook(projectId, file, configuration); return `Muster erkannt: ${result.sheetName}, ${result.columnCount} Spalten, ${result.objectCount} Objekte.`; }} onSave={save} /> : null}
     {importOpen && project && snapshot ? <RevitInitialImportWizard projectId={projectId} expectedRevision={project.currentRevision} initialConfiguration={snapshot.configuration} onClose={() => setImportOpen(false)} onImported={({ history }) => { setProject({ ...project, currentRevision: history.currentRevision }); setImportOpen(false); void Promise.all([getExternalInitialImportStatus(projectId), getExternalModelConfiguration(projectId)]).then(([status, configuration]) => { setImportStatus(status); setSnapshot(configuration.configuration); }); }} /> : null}
   </main>;
 }
diff --git a/src/frontend/components/revit-xlsx-settings-modal.tsx b/src/frontend/components/revit-xlsx-settings-modal.tsx
index 7041ebc..899c3ca 100644
--- a/src/frontend/components/revit-xlsx-settings-modal.tsx
+++ b/src/frontend/components/revit-xlsx-settings-modal.tsx
@@ -13,8 +13,9 @@ const labels: Record<ExternalXlsxColumnKey, string> = {
   electricalPowerW: "Elektrische Leistung", voltageV: "Spannung", currentA: "Stromstärke",
 };
 
-export function RevitXlsxSettingsModal({ configuration, isSaving, onClose, onInspectSample, onSave }: {
+export function RevitXlsxSettingsModal({ configuration, isNewConfiguration = false, isSaving, onClose, onInspectSample, onSave }: {
   configuration: ExternalModelConfiguration;
+  isNewConfiguration?: boolean;
   isSaving: boolean;
   onClose: () => void;
   onInspectSample: (file: File, configuration: ExternalModelConfiguration) => Promise<string>;
@@ -33,7 +34,7 @@ export function RevitXlsxSettingsModal({ configuration, isSaving, onClose, onIns
     }
   }
 
-  return <FormModal title="Revit-XLSX-Einstellungen" description="Layout und Spalten der Linear-Bauteilliste" isSaving={isSaving} onClose={onClose} submitDisabled={JSON.stringify(draft) === JSON.stringify(configuration)} submitLabel="Einstellungen speichern" onSubmit={(event: FormEvent) => { event.preventDefault(); void onSave(draft); }}>
+  return <FormModal title="Revit-XLSX-Einstellungen" description="Layout und Spalten der Linear-Bauteilliste" isSaving={isSaving} onClose={onClose} submitDisabled={!isNewConfiguration && JSON.stringify(draft) === JSON.stringify(configuration)} submitLabel="Einstellungen speichern" onSubmit={(event: FormEvent) => { event.preventDefault(); void onSave(draft); }}>
     <div className="row g-3">
       <div className="col-12"><label className="form-label" htmlFor="revit-sample">Musterdatei prüfen</label><input id="revit-sample" className="form-control" type="file" accept=".xlsx" onChange={(event) => void inspectSample(event.target.files?.[0])} />{sampleStatus ? <div className="form-text">{sampleStatus}</div> : null}</div>
       {(["headerRow", "firstDataRow", "firstDataColumn"] as const).map((key) => <div className="col-md-4" key={key}><label className="form-label" htmlFor={`layout-${key}`}>{key === "headerRow" ? "Kopfzeile" : key === "firstDataRow" ? "Erste Datenzeile" : "Erste Datenspalte"}</label><input id={`layout-${key}`} className="form-control" min={1} type="number" value={draft.layout[key]} onChange={(event) => setDraft({ ...draft, layout: { ...draft.layout, [key]: Number(event.target.value) } })} /></div>)}
diff --git a/tests/revit-xlsx-settings-api.test.ts b/tests/revit-xlsx-settings-api.test.ts
index ed91b57..4f13b70 100644
--- a/tests/revit-xlsx-settings-api.test.ts
+++ b/tests/revit-xlsx-settings-api.test.ts
@@ -59,6 +59,8 @@ describe("Revit XLSX settings", () => {
     assert.match(revitPage, /Importstatus/);
     assert.match(settings, /Musterdatei prüfen/);
     assert.match(settings, /Kombinierte Stromkreisspalte/);
+    assert.match(settings, /isNewConfiguration/);
+    assert.match(revitPage, /isNewConfiguration={snapshot === null}/);
     assert.match(wizard, /Schritt.*von/);
     assert.match(wizard, /keine Gerätezeilen, Stromkreise oder BMKs/);
     assert.match(wizard, /GZF 1/);