diff --git a/src/private/fornitures/AddOrEditFurnitureVariantForm.jsx b/src/private/fornitures/AddOrEditFurnitureVariantForm.jsx
index eca2ca9..e1b5cb1 100644
--- a/src/private/fornitures/AddOrEditFurnitureVariantForm.jsx
+++ b/src/private/fornitures/AddOrEditFurnitureVariantForm.jsx
@@ -4,6 +4,8 @@ import { Box, Button, TextField, MenuItem, Grid } from '@mui/material';
 import FurnitureVariantApi from '../../api/furnitureVariantApi';
 import { useAuth } from '../../context/AuthContext';
 
+const DEFAULT_MODEL_ID = '8a23117b-acaf-4d87-b64f-a98e9b414796';
+
 export default function AddOrEditFurnitureVariantForm({ initialData, onAdd, onCancel }) {
   const { user } = useAuth();
   const token = user?.thalosToken || localStorage.getItem('thalosToken');
@@ -11,6 +13,7 @@ export default function AddOrEditFurnitureVariantForm({ initialData, onAdd, onCa
 
   const [form, setForm] = useState({
     _Id: '',
+    id: '',
     modelId: '',
     name: '',
     color: '',
@@ -28,6 +31,7 @@ export default function AddOrEditFurnitureVariantForm({ initialData, onAdd, onCa
     if (initialData) {
       setForm({
         _Id: initialData._id || initialData._Id || '',
+        id: initialData.id || initialData.Id || initialData._id || initialData._Id || '',
         modelId: initialData.modelId ?? '',
         name: initialData.name ?? '',
         color: initialData.color ?? '',
@@ -47,7 +51,8 @@ export default function AddOrEditFurnitureVariantForm({ initialData, onAdd, onCa
     } else {
       setForm({
         _Id: '',
-        modelId: '',
+        id: '',
+        modelId: DEFAULT_MODEL_ID,
         name: '',
         color: '',
         line: '',
@@ -70,6 +75,7 @@ export default function AddOrEditFurnitureVariantForm({ initialData, onAdd, onCa
       if (form._Id) {
         // UPDATE
         const payload = {
+          Id: form.id || form._Id, // backend requires Id
           _Id: form._Id,
           modelId: form.modelId,
           name: form.name,
@@ -119,8 +125,37 @@ export default function AddOrEditFurnitureVariantForm({ initialData, onAdd, onCa
     <Box sx={{ py: 2 }}>
       <Grid container spacing={2}>
         <Grid item xs={12} md={6}>
-          <TextField fullWidth label="Model Id" value={form.modelId} onChange={(e) => setVal('modelId', e.target.value)} />
+          <TextField
+            fullWidth
+            label="Model Id"
+            value={form.modelId}
+            onChange={(e) => setVal('modelId', e.target.value)}
+            disabled={!initialData}
+            helperText={!initialData ? 'Preset for new variant' : ''}
+          />
         </Grid>
+        {form.id && (
+          <Grid item xs={12} md={6}>
+            <TextField
+              fullWidth
+              label="Id"
+              value={form.id}
+              disabled
+              helperText="Record identifier (read-only)"
+            />
+          </Grid>
+        )}
+        {form._Id && (
+          <Grid item xs={12} md={6}>
+            <TextField
+              fullWidth
+              label="_Id"
+              value={form._Id}
+              disabled
+              helperText="Mongo identifier (read-only)"
+            />
+          </Grid>
+        )}
         <Grid item xs={12} md={6}>
           <TextField fullWidth label="Name" value={form.name} onChange={(e) => setVal('name', e.target.value)} />
         </Grid>
diff --git a/src/private/fornitures/FurnitureVariantManagement.jsx b/src/private/fornitures/FurnitureVariantManagement.jsx
index 725d8ac..e55dc02 100644
--- a/src/private/fornitures/FurnitureVariantManagement.jsx
+++ b/src/private/fornitures/FurnitureVariantManagement.jsx
@@ -99,6 +99,7 @@ export default function FurnitureVariantManagement() {
     const r = params.row;
     const normalized = {
       _id: r._id || r._Id || '',
+      _Id: r._id || r._Id || '',
       id: r.id || r.Id || '',
       modelId: r.modelId ?? '',
       name: r.name ?? '',
@@ -127,7 +128,7 @@ export default function FurnitureVariantManagement() {
 
   const handleConfirmDelete = async () => {
     try {
-      if (!apiRef.current || !rowToDelete?._id) throw new Error('Missing API or id');
+      if (!apiRef.current || !(rowToDelete?._id || rowToDelete?._Id)) throw new Error('Missing API or id');
       // If your inventory BFF uses soft delete via Update (status=Inactive), do this:
       const payload = {
         _Id: rowToDelete._id || rowToDelete._Id,