AI-generated Key Takeaways
- 
          PlacementError.Reason lists possible reasons for errors related to placements in the ContentBundleService. 
- 
          These reasons include issues with entity types, assigning shared inventory, combining inventory from different distributor networks, and mixing local and shared inventory. 
- 
          An UNKNOWNreason is included for values not exposed by the requested API version.
Possible reasons for the error.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| INVALID_ENTITY_TYPE | Entity type is something other than inventory or content. | 
| SHARED_INVENTORY_ASSIGNED | Shared inventory cannot be assigned to a placement. | 
| PLACEMENTS_CANNOT_INCLUDE_INVENTORY_FROM_MULTIPLE_DISTRIBUTOR_NETWORKS | Shared inventory from one distributor network cannot be in the same placement with inventory from another distributor. | 
| PLACEMENTS_CANNOT_INCLUDE_BOTH_LOCAL_AND_SHARED_INVENTORY | Shared inventory and local inventory cannot be in the same placement. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |