diff --git a/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml b/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml
index 173e770..5db5c00 100644
--- a/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml
+++ b/xyz/openbmc_project/Inventory/Decorator/Asset.interface.yaml
@@ -29,3 +29,12 @@
       description: >
           The Sub model of the item.
       default: ""
+    - name: SparePartNumber
+      type: string
+      description: >
+          An alternative PartNumber used for field replacement of the
+          Asset.
+          A default value (empty string) indicates that the Asset has
+          no specific SparePartNumber and instead PartNumber should
+          be used in user interfaces.
+      default: ""