diff --git a/src/app/(main)/report/ReportSelectionDashboard.tsx b/src/app/(main)/report/ReportSelectionDashboard.tsx
index b5eb3802..3f165b8c 100644
--- a/src/app/(main)/report/ReportSelectionDashboard.tsx
+++ b/src/app/(main)/report/ReportSelectionDashboard.tsx
@@ -17,7 +17,7 @@ import OutboundOutlinedIcon from "@mui/icons-material/OutboundOutlined";
 import BarChartOutlinedIcon from "@mui/icons-material/BarChartOutlined";
 import PieChartOutlineOutlinedIcon from "@mui/icons-material/PieChartOutlineOutlined";
 import type { SvgIconComponent } from "@mui/icons-material";
-import { REPORTS } from "@/config/reportConfig";
+import { DEMO_UNAVAILABLE_REPORT_IDS, REPORTS } from "@/config/reportConfig";
 import { REPORT_CATEGORIES, type ReportCategoryConfig } from "./reportCategories";
 import { useReportLabels } from "./reportI18n";
 
@@ -52,12 +52,16 @@ function ReportCard({
   title,
   accent,
   selected,
+  unavailable,
+  unavailableLabel,
   onClick,
 }: {
   reportId: string;
   title: string;
   accent: string;
   selected: boolean;
+  unavailable: boolean;
+  unavailableLabel: string;
   onClick: () => void;
 }) {
   const Icon = REPORT_ICON_MAP[reportId] ?? Inventory2OutlinedIcon;
@@ -66,7 +70,9 @@ function ReportCard({
     <Box
       component="button"
       type="button"
-      onClick={onClick}
+      disabled={unavailable}
+      onClick={unavailable ? undefined : onClick}
+      aria-disabled={unavailable}
       sx={{
         display: "flex",
         alignItems: "center",
@@ -74,17 +80,22 @@ function ReportCard({
         width: "100%",
         p: 1.5,
         textAlign: "left",
-        cursor: "pointer",
+        cursor: unavailable ? "not-allowed" : "pointer",
         border: "1px solid",
-        borderColor: selected ? accent : "divider",
+        borderColor: unavailable ? "action.disabledBackground" : selected ? accent : "divider",
         borderRadius: 1.5,
-        bgcolor: "background.paper",
-        boxShadow: selected ? 2 : "0 1px 3px rgba(0,0,0,0.06)",
+        bgcolor: unavailable ? "action.hover" : "background.paper",
+        color: unavailable ? "text.disabled" : "text.primary",
+        boxShadow: !unavailable && selected ? 2 : "0 1px 3px rgba(0,0,0,0.06)",
+        opacity: unavailable ? 0.72 : 1,
+        filter: unavailable ? "grayscale(1)" : "none",
         transition: "border-color 0.15s, box-shadow 0.15s",
-        "&:hover": {
-          borderColor: accent,
-          boxShadow: 2,
-        },
+        "&:hover": unavailable
+          ? {}
+          : {
+              borderColor: accent,
+              boxShadow: 2,
+            },
       }}
     >
       <Box
@@ -95,16 +106,23 @@ function ReportCard({
           width: 40,
           height: 40,
           borderRadius: 1,
-          bgcolor: `${accent}18`,
-          color: accent,
+          bgcolor: unavailable ? "action.disabledBackground" : `${accent}18`,
+          color: unavailable ? "text.disabled" : accent,
           flexShrink: 0,
         }}
       >
         <Icon fontSize="small" />
       </Box>
-      <Typography variant="body2" fontWeight={selected ? 600 : 400} sx={{ lineHeight: 1.35 }}>
-        {title}
-      </Typography>
+      <Box sx={{ minWidth: 0 }}>
+        <Typography variant="body2" fontWeight={selected && !unavailable ? 600 : 400} sx={{ lineHeight: 1.35 }}>
+          {title}
+        </Typography>
+        {unavailable && (
+          <Typography variant="caption" sx={{ display: "block", lineHeight: 1.3, color: "text.secondary" }}>
+            {unavailableLabel}
+          </Typography>
+        )}
+      </Box>
     </Box>
   );
 }
@@ -118,7 +136,7 @@ function CategoryColumn({
   selectedReportId: string;
   onSelectReport: (reportId: string) => void;
 }) {
-  const { reportTitle, categoryTitle } = useReportLabels();
+  const { t, reportTitle, categoryTitle } = useReportLabels();
   const reports = category.reportIds
     .map((id) => reportById[id])
     .filter(Boolean);
@@ -161,6 +179,8 @@ function CategoryColumn({
                 title={reportTitle(report)}
                 accent={category.accent}
                 selected={selectedReportId === report.id}
+                unavailable={DEMO_UNAVAILABLE_REPORT_IDS.has(report.id)}
+                unavailableLabel={t("unavailableInDemo")}
                 onClick={() => onSelectReport(report.id)}
               />
             </Grid>
diff --git a/src/app/(main)/report/bomShopSyncReportApi.ts b/src/app/(main)/report/bomShopSyncReportApi.ts
index d3eee465..043e67b7 100644
--- a/src/app/(main)/report/bomShopSyncReportApi.ts
+++ b/src/app/(main)/report/bomShopSyncReportApi.ts
@@ -205,7 +205,7 @@ function toMaterialExcelRow(
 
 export async function generateBomShopSyncReportExcel(
   criteria: Record<string, string>,
-  reportTitle: string = "M18 BOM Shop 同步記錄",
+  reportTitle: string = "BOM Shop 同步記錄",
   t?: TFunction,
 ): Promise<void> {
   const L = bomSyncLabels(t);
diff --git a/src/app/(main)/report/grnReportApi.ts b/src/app/(main)/report/grnReportApi.ts
index 2e2f001f..772aa271 100644
--- a/src/app/(main)/report/grnReportApi.ts
+++ b/src/app/(main)/report/grnReportApi.ts
@@ -33,12 +33,6 @@ export interface GrnReportRow {
   lineAmount?: number;
   /** PO currency code (currency.code) */
   currencyCode?: string;
-  /** M18 AN document code from m18_goods_receipt_note_log.grn_code */
-  grnCode?: string;
-  /** M18 record id (m18_record_id) */
-  grnId?: number | string;
-  /** From purchase_order.m18CreatedUId; e.g. "2569 (legato)" */
-  poM18CreatorDisplay?: string;
   [key: string]: unknown;
 }
 
@@ -54,7 +48,6 @@ export interface ListedPoAmounts {
     poCode?: string;
     currencyCode?: string;
     totalAmount?: number;
-    grnCodes?: string;
   }[];
 }
 
@@ -148,13 +141,9 @@ function grnLabels(t?: TFunction) {
     unitPrice: tx(t, "excel.grn.unitPrice", "單價"),
     currency: tx(t, "excel.grn.currency", "貨幣"),
     amount: tx(t, "excel.grn.amount", "金額"),
-    grnCode: tx(t, "excel.grn.grnCode", "M18 入倉單號"),
-    grnId: tx(t, "excel.grn.grnId", "M18 記錄編號"),
-    poCreator: tx(t, "excel.grn.poCreator", "PO建立者(M18)"),
     note: tx(t, "excel.grn.note", "備註"),
     category: tx(t, "excel.grn.category", "類別"),
     totalAmount: tx(t, "excel.grn.totalAmount", "金額"),
-    grnCodes: tx(t, "excel.grn.grnCodes", "M18 入倉單號"),
     noCompletedPo: tx(t, "excel.grn.noCompletedPo", "（篩選範圍內無已完成之 PO 行）"),
     categoryCurrencyTotal: tx(t, "excel.grn.categoryCurrencyTotal", "貨幣小計"),
     categoryPo: tx(t, "excel.grn.categoryPo", "訂單"),
@@ -187,9 +176,6 @@ function toExcelRow(
     base[L.currency] = r.currencyCode ?? "";
     base[L.amount] = moneyCellValue(r.lineAmount);
   }
-  base[L.grnCode] = r.grnCode ?? "";
-  base[L.grnId] = r.grnId ?? "";
-  base[L.poCreator] = r.poM18CreatorDisplay ?? "";
   return base;
 }
 
@@ -213,7 +199,6 @@ function buildListedPoAmountSheetRows(
       [L.poNo]: "",
       [L.currency]: c.currencyCode ?? "",
       [L.totalAmount]: moneyCellValue(c.totalAmount),
-      [L.grnCodes]: "",
     });
   }
   for (const p of listed.byPurchaseOrder) {
@@ -223,7 +208,6 @@ function buildListedPoAmountSheetRows(
       [L.poNo]: p.poCode ?? "",
       [L.currency]: p.currencyCode ?? "",
       [L.totalAmount]: moneyCellValue(p.totalAmount),
-      [L.grnCodes]: p.grnCodes ?? "",
     });
   }
   return out;
diff --git a/src/app/(main)/report/page.tsx b/src/app/(main)/report/page.tsx
index c559f7bf..165392fc 100644
--- a/src/app/(main)/report/page.tsx
+++ b/src/app/(main)/report/page.tsx
@@ -25,7 +25,7 @@ import {
 } from '@mui/material';
 import DownloadIcon from '@mui/icons-material/Download';
 import InfoOutlinedIcon from '@mui/icons-material/InfoOutlined';
-import { REPORTS } from '@/config/reportConfig';
+import { DEMO_UNAVAILABLE_REPORT_IDS, REPORTS } from '@/config/reportConfig';
 import { mergePastedItemCodes, buildItemCodePasteRequestBody, parseItemCodeTokens } from './parseItemCodeTokens';
 import { NEXT_PUBLIC_API_URL } from '@/config/api';
 import { clientAuthFetch } from '@/app/utils/clientAuthFetch';
@@ -152,6 +152,7 @@ export default function ReportPage() {
   [selectedReportId]);
 
   const handleSelectReport = (reportId: string) => {
+    if (DEMO_UNAVAILABLE_REPORT_IDS.has(reportId)) return;
     if (reportId === selectedReportId) return;
     setSelectedReportId(reportId);
     setFieldErrors({});
@@ -452,6 +453,7 @@ export default function ReportPage() {
 
   const executeExcelReport = async () => {
     if (!currentReport) return;
+    if (DEMO_UNAVAILABLE_REPORT_IDS.has(currentReport.id)) return;
     if (excelInFlightRef.current) return;
     excelInFlightRef.current = true;
     setLoading(true);
diff --git a/src/app/(main)/report/reportCategories.ts b/src/app/(main)/report/reportCategories.ts
index aee5b7cf..2b2f7aa7 100644
--- a/src/app/(main)/report/reportCategories.ts
+++ b/src/app/(main)/report/reportCategories.ts
@@ -33,6 +33,6 @@ export const REPORT_CATEGORIES: ReportCategoryConfig[] = [
     headerBg: "#f5d4a8",
     bodyBg: "#fdf6ec",
     accent: "#e65100",
-    reportIds: ["rep-006", "rep-005"],
+    reportIds: ["rep-006", "rep-005", "rep-015"],
   },
 ];
diff --git a/src/app/(main)/testing/page.tsx b/src/app/(main)/testing/page.tsx
index 06e9260b..9ee34ced 100644
--- a/src/app/(main)/testing/page.tsx
+++ b/src/app/(main)/testing/page.tsx
@@ -37,8 +37,6 @@ import {
   type LaserBag2AutoSendReport,
   type LaserLastReceiveSuccess,
 } from "@/app/api/laserPrint/actions";
-import * as XLSX from "xlsx";
-
 interface TabPanelProps {
   children?: React.ReactNode;
   index: number;
@@ -175,49 +173,6 @@ export default function TestingPage() {
     };
   }, [tabValue]);
 
-  const handleDownloadGrnPreviewXlsx = async () => {
-    try {
-      const response = await clientAuthFetch(
-        `${NEXT_PUBLIC_API_URL}/report/grn-preview-m18?receiptDate=${encodeURIComponent(
-          grnPreviewReceiptDate,
-        )}`,
-        { method: "GET" },
-      );
-      if (response.status === 401 || response.status === 403) return;
-      if (!response.ok) throw new Error(`Download failed: ${response.status}`);
-
-      const data = await response.json();
-      const rows = Array.isArray(data?.rows) ? data.rows : [];
-
-      const ws = XLSX.utils.json_to_sheet(rows);
-      const wb = XLSX.utils.book_new();
-      XLSX.utils.book_append_sheet(wb, ws, "GRN Preview");
-
-      const xlsxArrayBuffer = XLSX.write(wb, {
-        bookType: "xlsx",
-        type: "array",
-      });
-      const blob = new Blob([xlsxArrayBuffer], {
-        type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
-      });
-
-      const url = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = url;
-      link.setAttribute(
-        "download",
-        `grn-preview-m18-${grnPreviewReceiptDate}.xlsx`,
-      );
-      document.body.appendChild(link);
-      link.click();
-      link.remove();
-      window.URL.revokeObjectURL(url);
-    } catch (e) {
-      console.error("GRN Preview XLSX Download Error:", e);
-      alert("GRN Preview XLSX download failed. Check console/network.");
-    }
-  };
-
   const downloadBlob = (blob: Blob, filename: string) => {
     const url = window.URL.createObjectURL(blob);
     const link = document.createElement("a");
@@ -524,33 +479,35 @@ export default function TestingPage() {
       </Tabs>
 
       <TabPanel value={tabValue} index={0}>
-        <Section title="1. GRN Preview (M18)">
-          <Stack
-            direction="row"
-            spacing={2}
-            sx={{ mb: 2, alignItems: "center" }}
-          >
-            <TextField
-              size="small"
-              label="Receipt Date"
-              type="date"
-              value={grnPreviewReceiptDate}
-              onChange={(e) => setGrnPreviewReceiptDate(e.target.value)}
-              InputLabelProps={{ shrink: true }}
-            />
-            <Button
-              variant="contained"
-              color="success"
-              size="medium"
-              startIcon={<FileDownload />}
-              onClick={handleDownloadGrnPreviewXlsx}
+        <Section title="1. GRN Preview">
+          <Box sx={{ opacity: 0.55, filter: "grayscale(1)", pointerEvents: "none" }}>
+            <Stack
+              direction="row"
+              spacing={2}
+              sx={{ mb: 2, alignItems: "center" }}
             >
-              Download GRN Preview XLSX
-            </Button>
-          </Stack>
-          <Typography variant="body2" color="textSecondary">
-            Backend endpoint:{" "}
-            <code>/report/grn-preview-m18?receiptDate=YYYY-MM-DD</code>
+              <TextField
+                size="small"
+                label="Receipt Date"
+                type="date"
+                value={grnPreviewReceiptDate}
+                onChange={(e) => setGrnPreviewReceiptDate(e.target.value)}
+                InputLabelProps={{ shrink: true }}
+                disabled
+              />
+              <Button
+                variant="contained"
+                color="success"
+                size="medium"
+                startIcon={<FileDownload />}
+                disabled
+              >
+                Download GRN Preview XLSX
+              </Button>
+            </Stack>
+          </Box>
+          <Typography variant="body2" color="text.secondary">
+            Unavailable in demo mode
           </Typography>
         </Section>
       </TabPanel>
diff --git a/src/config/reportConfig.ts b/src/config/reportConfig.ts
index cb3c1e5c..06f01e0c 100644
--- a/src/config/reportConfig.ts
+++ b/src/config/reportConfig.ts
@@ -33,6 +33,9 @@ export interface ReportField {
 
 export type ReportResponseType = 'pdf' | 'excel';
 
+/** Live-system reports. The demo page shows them greyed out. */
+export const DEMO_UNAVAILABLE_REPORT_IDS = new Set(["rep-015"]);
+
 export interface ReportDefinition {
   id: string;
   title: string;
@@ -459,7 +462,7 @@ export const REPORTS: ReportDefinition[] = [
   },
   {
     id: "rep-015",
-    title: "M18 BOM Shop 同步記錄",
+    title: "BOM Shop 同步記錄",
     apiEndpoint: `${NEXT_PUBLIC_API_URL}/report/bom-shop-sync-history`,
     responseType: "excel",
     fields: [
diff --git a/src/i18n/en/report.json b/src/i18n/en/report.json
index d5b942ad..d58c6754 100644
--- a/src/i18n/en/report.json
+++ b/src/i18n/en/report.json
@@ -15,6 +15,7 @@
   "noDataFoundTitle": "No Data Found / 查無資料",
   "noDataFoundHint": "No inventory records match your search. Please try adjusting the filters.",
   "ok": "OK",
+  "unavailableInDemo": "Unavailable in demo mode",
   "missingRequired": "Missing required fields:\n- {{fields}}",
   "requiredField": "This is a required field",
   "dateNotBeforeToday": "Date cannot be before today:\n- {{fields}}",
@@ -231,7 +232,7 @@
       }
     },
     "rep-015": {
-      "title": "M18 BOM Shop Sync History",
+      "title": "BOM Shop Sync History",
       "fields": {
         "syncDateStart": "Sync Date Start",
         "syncDateEnd": "Sync Date End",
@@ -332,13 +333,9 @@
       "unitPrice": "Unit Price",
       "currency": "Currency",
       "amount": "Amount",
-      "grnCode": "GRN Code / M18 Receipt No.",
-      "grnId": "GRN Id / M18 Record Id",
-      "poCreator": "PO creator (M18)",
       "note": "Note",
       "category": "Category",
-      "totalAmount": "Total Amount",
-      "grnCodes": "GRN Code(s) / M18 Receipt No."
+      "totalAmount": "Total Amount"
     },
     "bomSync": {
       "sheetSync": "BOM Sync Log",
diff --git a/src/i18n/zh/report.json b/src/i18n/zh/report.json
index 301f63a9..d0b8fa4c 100644
--- a/src/i18n/zh/report.json
+++ b/src/i18n/zh/report.json
@@ -15,6 +15,7 @@
   "noDataFoundTitle": "查無資料",
   "noDataFoundHint": "找不到符合您搜尋條件的庫存資料，請嘗試調整篩選條件。",
   "ok": "確定",
+  "unavailableInDemo": "示範模式無法使用",
   "missingRequired": "缺少必填條件:\n- {{fields}}",
   "requiredField": "此為必填欄位",
   "dateNotBeforeToday": "日期不可早於今天:\n- {{fields}}",
@@ -231,7 +232,7 @@
       }
     },
     "rep-015": {
-      "title": "M18 BOM Shop 同步記錄",
+      "title": "BOM Shop 同步記錄",
       "fields": {
         "syncDateStart": "同步日期：由",
         "syncDateEnd": "同步日期：至",
@@ -332,13 +333,9 @@
       "unitPrice": "單價",
       "currency": "貨幣",
       "amount": "金額",
-      "grnCode": "M18 入倉單號",
-      "grnId": "M18 記錄編號",
-      "poCreator": "PO建立者(M18)",
       "note": "備註",
       "category": "類別",
-      "totalAmount": "金額",
-      "grnCodes": "M18 入倉單號"
+      "totalAmount": "金額"
     },
     "bomSync": {
       "sheetSync": "BOM同步記錄",