diff --git a/web-v2/src/lib/inventoryFunctionApi.ts b/web-v2/src/lib/inventoryFunctionApi.ts
new file mode 100644
index 0000000..1cc8dfa
--- /dev/null
+++ b/web-v2/src/lib/inventoryFunctionApi.ts
@@ -0,0 +1,86 @@
+import { apiRequest } from './api';
+
+export interface InventoryFunction {
+  id: string;
+  code: string;
+  name: string;
+  description: string | null;
+  isActive: boolean;
+  sortOrder: number;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface InventoryFunctionAssignment {
+  id: string;
+  assetId: string;
+  functionId: string;
+  functionCode: string;
+  functionName: string;
+  validFrom: string;
+  validUntil: string | null;
+  reason: string | null;
+  changedBy: string | null;
+  changedByUsername: string | null;
+  createdAt: string;
+}
+
+export interface InventoryFunctionHistory {
+  asset: {
+    id: string;
+    code: string;
+    name: string;
+    typeCode: string;
+    typeName: string;
+    familyCode: string | null;
+    familyName: string | null;
+  };
+  currentFunction: InventoryFunctionAssignment | null;
+  history: InventoryFunctionAssignment[];
+}
+
+export async function listInventoryFunctions(includeInactive = false) {
+  const query = includeInactive ? '?includeInactive=true' : '';
+  return (await apiRequest<{ data: InventoryFunction[] }>(`/inventory-functions${query}`)).data;
+}
+
+export function getInventoryFunctionHistory(assetId: string) {
+  return apiRequest<InventoryFunctionHistory>(`/assets/${assetId}/function-history`);
+}
+
+export function changeInventoryFunction(
+  assetId: string,
+  input: { functionId: string; effectiveAt?: string; reason?: string | null },
+) {
+  return apiRequest<InventoryFunctionHistory>(`/assets/${assetId}/function`, {
+    method: 'POST',
+    body: JSON.stringify(input),
+  });
+}
+
+export function createInventoryFunction(input: {
+  code: string;
+  name: string;
+  description?: string | null;
+  sortOrder?: number;
+}) {
+  return apiRequest<InventoryFunction>('/inventory-functions', {
+    method: 'POST',
+    body: JSON.stringify(input),
+  });
+}
+
+export function updateInventoryFunction(
+  id: string,
+  input: {
+    name?: string;
+    description?: string | null;
+    isActive?: boolean;
+    sortOrder?: number;
+  },
+) {
+  return apiRequest<InventoryFunction>(`/inventory-functions/${id}`, {
+    method: 'PATCH',
+    body: JSON.stringify(input),
+  });
+}