| default_unit | Unit of measure used for the item or quantity, for example each, kg, m, liter, or another enterprise-specific unit. | string | Datatype | False | False | 0..1 | - | False | False |
| effectivity | Date, serial, lot, variant, or other effectivity expression controlling when the item, usage, or structure is valid. | string | Datatype | False | False | 0..1 | - | False | False |
| find_number | Find number or BOM position identifier commonly used to identify an item within a product or manufacturing structure. | string | Datatype | False | False | 0..1 | - | False | False |
| line_number | Line number, item number, or sequence number of this usage within its structure. | string | Datatype | False | False | 0..1 | - | False | False |
| optionality | Indicates whether the item is mandatory, optional, variant-dependent, or otherwise conditionally present. | string | Datatype | False | False | 0..1 | - | False | False |
| position_identifier | Optional position, installation, station, or occurrence identifier used to distinguish this item within a product structure. | string | Datatype | False | False | 0..1 | - | False | False |
| quantity | Planned or nominal quantity of the used item in the product or assembly structure. | decimal | Datatype | False | False | 0..1 | - | False | False |
| reference_designator | Reference designator or occurrence label used to identify a particular usage position, especially for electrical, electronic, or CAD-derived structures. | string | Datatype | False | False | 0..1 | - | False | False |
| description | Human-readable description. | string | Datatype | False | False | 0..1 | IdentifiedThing | False | False |
| id | Stable identifier of the object. | uriorcurie | Datatype | True | False | 1..1 | IdentifiedThing | False | True |
| name | Human-readable name. | string | Datatype | False | False | 0..1 | IdentifiedThing | False | False |
| editing_state | Editing, authoring, or change state of the item or structure, for example draft, checked out, checked in, under change, locked, frozen, or released. | string | Datatype | False | False | 0..1 | PartItem | False | False |
| item_version | Version, revision, iteration, or other version label of the part-like item. This slot is shared by WindchillPart, ProductTreeItem, AssemblyTreeItem, and AsBuiltItem through PartItem. | string | Datatype | False | False | 0..1 | PartItem | False | False |
| lifecycle_state | Lifecycle state of the item or structure, for example In Work, Released, Frozen, Obsolete, Completed, Accepted, or another organization-specific state. | string | Datatype | False | False | 0..1 | PartItem | False | False |
| external_id | Native identifier of the object in the source tool. | string | Datatype | False | False | 0..1 | ToolObject | False | False |
| source_system | Concrete source system or repository. | string | Datatype | False | False | 0..1 | ToolObject | False | False |
| tool_name | Name of the tool where the object is managed. | string | Datatype | False | False | 0..1 | ToolObject | False | False |