diff --git a/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx b/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx
index 97b91f3..6ee22f1 100644
--- a/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx
+++ b/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx
@@ -22,7 +22,11 @@ const TDRChartActionBar: React.FC = () => {
   const idsForSlot =
     selectedSlot !== null ? tdmChartData[selectedSlot] ?? [] : [];
 
+  const tdrDataById = useSelector(
+    (state: RootState) => state.tdrDataById.dataById
+  );
   const [selectedId, setSelectedId] = useState<number | null>(null);
+  const currentChartData = selectedId !== null ? tdrDataById[selectedId] : [];
 
   // 🔄 Dropdown-Auswahl: neue Messung laden
   const handleSelectChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
@@ -32,19 +36,15 @@ const TDRChartActionBar: React.FC = () => {
   };
 
   // 📌 Referenz setzen (nutzt Slotnummer + 1 für die API)
-  const handleSetReference = async () => {
-    if (selectedId === null || selectedSlot === null) return;
+  const handleSetReference = () => {
+    if (selectedSlot === null || !currentChartData?.length) return;
 
-    const apiSlot = selectedSlot + 1;
-    const url = `${window.location.origin}/CPL?seite.ACP&KTR${apiSlot}=${selectedId}`;
-    try {
-      const response = await fetch(url);
-      if (!response.ok) throw new Error("Fehler beim Setzen der Referenzkurve");
-      alert("✅ Referenzkurve erfolgreich gesetzt.");
-    } catch (error) {
-      console.error("❌ Fehler:", error);
-      alert("❌ Referenzkurve konnte nicht gesetzt werden.");
-    }
+    localStorage.setItem(
+      `ref-curve-slot${selectedSlot}`,
+      JSON.stringify(currentChartData)
+    );
+
+    alert("✅ Referenzkurve lokal gespeichert (nur im Browser)");
   };
 
   // 📥 Beim Slot-Wechsel TDM-Liste + letzte ID laden
diff --git a/config/webVersion.ts b/config/webVersion.ts
index 499819a..8505fdd 100644
--- a/config/webVersion.ts
+++ b/config/webVersion.ts
@@ -6,5 +6,5 @@
 2: Patch oder Hotfix (Bugfixes oder kleine Änderungen).
 
 */
-const webVersion = "1.6.186";
+const webVersion = "1.6.187";
 export default webVersion;
diff --git a/redux/thunks/fetchReferenceCurveBySlotThunk.ts b/redux/thunks/fetchReferenceCurveBySlotThunk.ts
index a4be147..b5ca12f 100644
--- a/redux/thunks/fetchReferenceCurveBySlotThunk.ts
+++ b/redux/thunks/fetchReferenceCurveBySlotThunk.ts
@@ -1,4 +1,4 @@
-// /redux/thunks/fetchAllTDRReferenceChartThunk.ts
+// /redux/thunks/fetchReferenceCurveBySlotThunk.ts
 import { createAsyncThunk } from "@reduxjs/toolkit";
 import { fetchTDRReferenceCurve } from "../../services/fetchTDRReferenceCurve";
 
diff --git a/services/fetchTDRReferenceCurve.ts b/services/fetchTDRReferenceCurve.ts
index f2f2b5d..d7cf096 100644
--- a/services/fetchTDRReferenceCurve.ts
+++ b/services/fetchTDRReferenceCurve.ts
@@ -1,11 +1,17 @@
 // /services/fetchTDRReferenceCurve.ts
+
 export const fetchTDRReferenceCurve = async (
   slot: number
 ): Promise<any[] | null> => {
-  if (typeof window === "undefined") return null;
+  // ✅ Erst aus localStorage lesen
+  const local = localStorage.getItem(`ref-curve-slot${slot}`);
+  if (local) {
+    console.log(`📦 Lade Referenzkurve für Slot ${slot} aus localStorage`);
+    return JSON.parse(local);
+  }
 
+  // 🔁 Fallback: Datei oder Produktion-API
   const isDev = process.env.NEXT_PUBLIC_NODE_ENV === "development";
-
   const url = isDev
     ? `/CPLmockData/tdr-reference-curves/slot${slot}.json`
     : `${window.location.origin}/CPL?Service/empty.acp&TDRR=${slot}`;
@@ -15,10 +21,7 @@ export const fetchTDRReferenceCurve = async (
     if (!res.ok) throw new Error(`HTTP ${res.status}`);
     return await res.json();
   } catch (error) {
-    console.error(
-      `❌ Fehler beim Laden der Referenzkurve für Slot ${slot}:`,
-      error
-    );
+    console.error(`❌ Fehler beim Laden von Slot ${slot}:`, error);
     return null;
   }
 };