diff --git a/web/src/components/CategorySelect.jsx b/web/src/components/CategorySelect.jsx
index 5910c9b..9019fd7 100644
--- a/web/src/components/CategorySelect.jsx
+++ b/web/src/components/CategorySelect.jsx
@@ -34,7 +34,9 @@ export default function CategorySelect({
 
   const isRoot = value == null || value === "";
   const extra = extraOptions.find((o) => String(o.value) === String(value));
-  const selectedId = !isRoot && !extra ? Number(value) : null;
+  // Wert unverändert übernehmen: IDs können Zahlen (Kategorien) ODER
+  // Zeichenketten (Lagerort-Codes) sein – Number() würde Codes zu NaN machen.
+  const selectedId = !isRoot && !extra ? value : null;
   const label = isRoot ? rootLabel : extra ? extra.label : nameById[selectedId] ?? rootLabel;
 
   function place() {
@@ -155,7 +157,7 @@ export default function CategorySelect({
                 )}
                 <button
                   type="button"
-                  className={`tree-pop-opt ${selectedId === n.id ? "sel" : ""}`}
+                  className={`tree-pop-opt ${String(selectedId) === String(n.id) ? "sel" : ""}`}
                   onClick={() => pick(n.id)}
                 >
                   {n.name}