diff --git a/mini-frontend/src/views/inventario/InmovilizarLotesView.tsx b/mini-frontend/src/views/inventario/InmovilizarLotesView.tsx
index 24b0b3f..0d447bf 100644
--- a/mini-frontend/src/views/inventario/InmovilizarLotesView.tsx
+++ b/mini-frontend/src/views/inventario/InmovilizarLotesView.tsx
@@ -177,7 +177,13 @@ export default function InmovilizarLotesView() {
     }
   };
 
+  // El stock que ya está en el almacén de inmovilizados (302) no se puede
+  // volver a inmovilizar, así que esa fila no es seleccionable.
+  const isLockedRow = (row: BatchWarehouseStock) =>
+    row.WarehouseCode === DEFAULT_TO_WAREHOUSE.code;
+
   const toggleRow = (row: BatchWarehouseStock) => {
+    if (isLockedRow(row)) return;
     const key = rowKey(row);
     setSelections((prev) => {
       if (key in prev) {
@@ -378,22 +384,27 @@ export default function InmovilizarLotesView() {
                     {group.rows.map((w) => {
                       const key = rowKey(w);
                       const isChecked = key in selections;
+                      const isLocked = isLockedRow(w);
                       const rawQuantity = selections[key] ?? "";
                       const rowQuantityError = isChecked ? quantityErrorFor(w, rawQuantity) : "";
                       return (
                         <tr
                           key={key}
                           onClick={() => toggleRow(w)}
-                          className={`cursor-pointer border-b border-[var(--color-border-light)] ${
-                            isChecked
-                              ? "bg-[var(--color-primary-active)]"
-                              : "hover:bg-[var(--color-sidebar-hover)]"
+                          title={isLocked ? "Stock ya inmovilizado (almacén 302)" : undefined}
+                          className={`border-b border-[var(--color-border-light)] ${
+                            isLocked
+                              ? "cursor-not-allowed opacity-50"
+                              : isChecked
+                                ? "cursor-pointer bg-[var(--color-primary-active)]"
+                                : "cursor-pointer hover:bg-[var(--color-sidebar-hover)]"
                           }`}
                         >
                           <td className="py-1.5 px-2" onClick={(e) => e.stopPropagation()}>
                             <input
                               type="checkbox"
                               checked={isChecked}
+                              disabled={isLocked}
                               onChange={() => toggleRow(w)}
                             />
                           </td>