diff --git a/src/albert/__init__.py b/src/albert/__init__.py
index 297b0d64..3396c193 100644
--- a/src/albert/__init__.py
+++ b/src/albert/__init__.py
@@ -4,4 +4,4 @@
 
 __all__ = ["Albert", "AlbertClientCredentials", "AlbertSSOClient"]
 
-__version__ = "1.11.0"
+__version__ = "1.13.0b1"
diff --git a/src/albert/resources/inventory.py b/src/albert/resources/inventory.py
index 33ea5003..5fa3290d 100644
--- a/src/albert/resources/inventory.py
+++ b/src/albert/resources/inventory.py
@@ -14,6 +14,7 @@
 from albert.resources.acls import ACL
 from albert.resources.cas import Cas
 from albert.resources.companies import Company
+from albert.resources.lists import ListItem
 from albert.resources.locations import Location
 from albert.resources.tagged_base import BaseTaggedResource
 from albert.resources.tags import Tag
@@ -75,6 +76,8 @@ class CasAmount(BaseAlbertModel):
         The SMILES string of the CAS Number resource. Obtained from the Cas object when provided.
     number: str | None
         The CAS number. Obtained from the Cas object when provided.
+    inventory_function: list[ListItem | EntityLink | str] | None
+        Business-controlled functions associated with the CAS in this inventory context.
 
     !!! tip
     ---
@@ -87,6 +90,9 @@ class CasAmount(BaseAlbertModel):
     target: float | None = Field(default=None, alias="inventoryValue")
     id: str | None = Field(default=None)
     cas_category: str | None = Field(default=None, alias="casCategory")
+    inventory_function: list[SerializeAsEntityLink[ListItem] | str] | None = Field(
+        default=None, alias="inventoryFunction"
+    )
     type: str | None = Field(default=None)
     classification_type: str | None = Field(default=None, alias="classificationType")
 
diff --git a/src/albert/resources/lists.py b/src/albert/resources/lists.py
index d3ff6cf7..7d16dfd8 100644
--- a/src/albert/resources/lists.py
+++ b/src/albert/resources/lists.py
@@ -27,7 +27,8 @@ class ListItem(BaseResource):
     category : ListItemCategory | None
         The category of the list item. Allowed values are `businessDefined`, `userDefined`, `projects`, and `extensions`.
     list_type : str | None
-        The type of the list item. Allowed values are `projectState` for `projects` and `extensions` for `extensions`.
+        The type of the list item. Allowed values are `projectState` for `projects`, `extensions` for `extensions`,
+        and `casCategory` or `inventoryFunction` for `inventory`.
     """
 
     name: str
diff --git a/src/albert/utils/inventory.py b/src/albert/utils/inventory.py
index 651c7d1e..af6e14ef 100644
--- a/src/albert/utils/inventory.py
+++ b/src/albert/utils/inventory.py
@@ -1,6 +1,7 @@
 from collections.abc import Iterable
 from typing import Any
 
+from albert.core.shared.models.base import BaseResource, EntityLink
 from albert.resources.inventory import CasAmount
 
 
@@ -56,6 +57,61 @@ def _build_cas_delete_operation(identifier: str) -> dict[str, Any]:
     }
 
 
+def _normalize_inventory_function_ids(
+    value: list[BaseResource | EntityLink | str] | None,
+) -> list[str]:
+    if not value:
+        return []
+    ids: list[str] = []
+    for item in value:
+        if isinstance(item, str):
+            if item:
+                ids.append(item)
+            continue
+        if isinstance(item, BaseResource):
+            if item.id:
+                ids.append(item.id)
+            continue
+        if isinstance(item, EntityLink):
+            if item.id:
+                ids.append(item.id)
+            continue
+    return ids
+
+
+def _build_inventory_function_operations(
+    *,
+    entity_id: str,
+    existing: list[BaseResource | EntityLink | str] | None,
+    updated: list[BaseResource | EntityLink | str] | None,
+) -> list[dict[str, Any]]:
+    existing_ids = set(_normalize_inventory_function_ids(existing))
+    updated_ids = set(_normalize_inventory_function_ids(updated))
+    to_add = sorted(updated_ids - existing_ids)
+    to_delete = sorted(existing_ids - updated_ids)
+
+    operations: list[dict[str, Any]] = []
+    if to_add:
+        operations.append(
+            {
+                "attribute": "inventoryFunction",
+                "entityId": entity_id,
+                "operation": "add",
+                "newValue": to_add,
+            }
+        )
+    if to_delete:
+        operations.append(
+            {
+                "attribute": "inventoryFunction",
+                "entityId": entity_id,
+                "operation": "delete",
+                "oldValue": to_delete,
+            }
+        )
+    return operations
+
+
 def _build_cas_scalar_operation(
     *,
     attribute: str,
@@ -117,6 +173,14 @@ def _build_cas_update_operations(existing: CasAmount, updated: CasAmount) -> lis
         if operation is not None:
             operations.append(operation)
 
+    operations.extend(
+        _build_inventory_function_operations(
+            entity_id=identifier,
+            existing=existing.inventory_function,
+            updated=updated.inventory_function,
+        )
+    )
+
     return operations
 
 
@@ -159,6 +223,13 @@ def _build_cas_patch_operations(
             )
             if target_operation is not None:
                 operations.append(target_operation)
+        operations.extend(
+            _build_inventory_function_operations(
+                entity_id=identifier,
+                existing=None,
+                updated=cas_amount.inventory_function,
+            )
+        )
 
     removals = [existing_lookup[key] for key in existing_lookup.keys() - updated_lookup.keys()]
     for cas_amount in removals:
diff --git a/tests/resources/test_inventory.py b/tests/resources/test_inventory.py
index a43b237b..03a4be09 100644
--- a/tests/resources/test_inventory.py
+++ b/tests/resources/test_inventory.py
@@ -29,6 +29,7 @@ def test_cas_amount_attributes():
         "target",
         "id",
         "cas_category",
+        "inventory_function",
         "created",
         "updated",
         "classification_type",