diff --git a/src/private/categories/AddOrEditCategoryForm.jsx b/src/private/categories/AddOrEditCategoryForm.jsx
index 40c2445..7014292 100644
--- a/src/private/categories/AddOrEditCategoryForm.jsx
+++ b/src/private/categories/AddOrEditCategoryForm.jsx
@@ -43,7 +43,7 @@ function formatDateSafe(value) {
   }).format(d);
 }
 
-export default function AddOrEditCategoryForm({ onAdd, initialData, onCancel, materials: materialsProp = [], initialMaterialNames = [] }) {
+export default function AddOrEditCategoryForm({ onAdd, initialData, onCancel, materials: materialsProp = [], initialMaterialNames = [], originalMongoId, originalGuid }) {
   const { user } = useAuth();
   const token = user?.thalosToken || localStorage.getItem('thalosToken');
   const api = useMemo(() => new CategoriesApi(token), [token]);
@@ -55,7 +55,7 @@ export default function AddOrEditCategoryForm({ onAdd, initialData, onCancel, ma
 const tagLabelById = useMemo(() => {
   const map = {};
   for (const t of allTags) {
-    const key = t._id || t.id;
+    const key = t._id;
     map[key] = t.tagName || t.name || key;
   }
   return map;
@@ -107,9 +107,9 @@ const tagLabelById = useMemo(() => {
     // Build a case-insensitive name -> id map
     const nameToId = new Map(
       allTags.map(t => {
-        const id = t._id || t.id;
+        const _id = t._id;
         const label = (t.tagName || t.name || '').toLowerCase();
-        return [label, id];
+        return [label, _id];
       })
     );
 
@@ -126,11 +126,9 @@ const tagLabelById = useMemo(() => {
   // set inicial
   useEffect(() => {
     if (initialData) {
-      const _Id = initialData._id || initialData._Id || '';
-      const id = initialData.id || initialData.Id || _Id || '';
       setForm({
-        _Id,
-        id,
+        _Id: initialData._Id,
+        Id: initialData.Id,
         tenantId: initialData.tenantId || extractTenantId(token) || '',
         tagName: initialData.tagName || initialData.name || '',
         typeId: initialData.typeId || '',
@@ -164,7 +162,7 @@ const tagLabelById = useMemo(() => {
     }
   }, [initialData]);
 
-  const isEdit = Boolean(form._Id || form.id);
+  const isEdit = Boolean(form._Id);
   const isAdd = !isEdit;
 
   const setVal = (name, value) => setForm(p => ({ ...p, [name]: value }));
@@ -199,8 +197,10 @@ const tagLabelById = useMemo(() => {
 
       if (form._Id) {
         // UPDATE
+        // Prefer Mongo _id (24-hex) if present; fallback to GUID
+        const idForUpdate = form._Id;
         const payload = {
-          id: form.id || form._Id, // backend acepta GUID; si no hay, mandamos _id
+          id: idForUpdate,
           ...base,
         };
         await api.update(payload);
@@ -221,9 +221,9 @@ const tagLabelById = useMemo(() => {
 
   const handleDelete = async () => {
     try {
-      // Try to use Mongo _Id (24-hex); if not present, fall back to GUID `id`.
-      const hex = typeof form._Id === 'string' && /^[0-9a-f]{24}$/i.test(form._Id) ? form._Id : null;
-      const idToUse = hex || form.id;
+      // Prefer Mongo _id if it looks like a 24-hex; otherwise fall back to GUID id
+      const hex = (typeof form._Id === 'string' && /^[0-9a-f]{24}$/i.test(form._Id)) ? form._Id : null;
+      const idToUse = hex || form._Id;
       if (!idToUse) throw new Error('Missing id to delete');
       await api.changeStatus({ id: idToUse, status: 'Inactive' });
       if (onAdd) {
@@ -273,7 +273,7 @@ const tagLabelById = useMemo(() => {
         required
       >
         {types.map((t) => {
-          const value = t._id || t.id; // prefer Mongo _id for 1:1 mapping
+          const value = t._id;
           const label = t.typeName || value;
           return (
             <MenuItem key={value} value={value}>
@@ -307,7 +307,7 @@ const tagLabelById = useMemo(() => {
         sx={{ mb: 2 }}
       >
         {allTags.map((t) => {
-          const value = t._id || t.id;
+          const value = t._id;
           const label = t.tagName || t.name || value;
           return (
             <MenuItem key={value} value={value}>
@@ -359,7 +359,7 @@ const tagLabelById = useMemo(() => {
         <MenuItem value="Inactive">Inactive</MenuItem>
       </TextField>
 
-      {form._Id || form.id ? (
+      {form._Id ? (
         <Box sx={{ display: 'grid', gridTemplateColumns: { xs: '1fr', md: '1fr 1fr' }, gap: 2, mt: 2 }}>
           <TextField label="Created At" value={formatDateSafe(form.createdAt)} InputProps={{ readOnly: true }} fullWidth />
           <TextField label="Created By" value={form.createdBy ?? '—'} InputProps={{ readOnly: true }} fullWidth />
@@ -369,7 +369,7 @@ const tagLabelById = useMemo(() => {
       ) : null}
 
       <Box display="flex" justifyContent="space-between" gap={1} mt={3}>
-        {(form._Id || form.id) ? (
+        {form._Id ? (
           <Button color="error" onClick={handleDelete}>Delete</Button>
         ) : <span />}
         <Box sx={{ display: 'flex', gap: 1 }}>
diff --git a/src/private/categories/Categories.jsx b/src/private/categories/Categories.jsx
index d2260c1..c2cdfa5 100644
--- a/src/private/categories/Categories.jsx
+++ b/src/private/categories/Categories.jsx
@@ -43,7 +43,7 @@ export default function Categories() {
       // Build a map of tagId -> tagName to resolve parent names
       const idToName = {};
       for (const item of list) {
-        const key = item?._id || item?._Id || item?.id || item?.Id;
+        const key = item?._id || item?.id;
         if (key) idToName[key] = item?.tagName || item?.name || '';
       }
 
@@ -53,6 +53,7 @@ export default function Categories() {
         const materialNames = parents
           .map((pid) => idToName[pid])
           .filter(Boolean);
+
         return {
           ...r,
           materialNames, // array of strings
@@ -75,8 +76,8 @@ export default function Categories() {
     const r = params?.row;
     if (!r) return;
     setEditingCategory({
-      _Id: r._id || r._Id || '',
-      id: r.id || r.Id || '',
+      _id: String(r._id || ''),
+      id: String(r.id || ''),
       tagName: r.tagName || r.name || '',
       typeId: r.typeId || '',
       parentTagId: Array.isArray(r.parentTagId) ? r.parentTagId : [],
@@ -87,8 +88,8 @@ export default function Categories() {
       materialNames: Array.isArray(r.materialNames)
         ? r.materialNames
         : (typeof r.material === 'string'
-            ? r.material.split(',').map(s => s.trim()).filter(Boolean)
-            : []),
+          ? r.material.split(',').map(s => s.trim()).filter(Boolean)
+          : []),
       createdAt: r.createdAt ?? null,
       createdBy: r.createdBy ?? null,
       updatedAt: r.updatedAt ?? null,
@@ -104,7 +105,7 @@ export default function Categories() {
   };
 
   const pickHexId = (r) =>
-    [r?._id, r?._Id, r?.id, r?.Id]
+    [r?._id, r?.id]
       .filter(Boolean)
       .find((x) => typeof x === 'string' && /^[0-9a-f]{24}$/i.test(x)) || null;
 
@@ -182,6 +183,7 @@ export default function Categories() {
     { field: 'tagName', headerName: 'Name', flex: 1.2, minWidth: 180 },
     { field: 'slug', headerName: 'Slug', flex: 1.0, minWidth: 160 },
     { field: 'icon', headerName: 'Icon', flex: 0.7, minWidth: 250 },
+
     /*
     { field: 'material', headerName: 'Material', flex: 1.2, minWidth: 200 },
     */