| Source Element | Usage | Target |
| InventoryItem | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-InventoryItem |
| InventoryItem.id | UseExtensionFromAncestor | - |
| InventoryItem.meta | UseExtensionFromAncestor | - |
| InventoryItem.implicitRules | UseExtensionFromAncestor | - |
| InventoryItem.language | UseExtensionFromAncestor | - |
| InventoryItem.text | UseExtensionFromAncestor | - |
| InventoryItem.contained | UseExtensionFromAncestor | - |
| InventoryItem.extension | UseExtensionFromAncestor | - |
| InventoryItem.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.identifier | UseExtensionFromAncestor | - |
| InventoryItem.status | UseExtensionFromAncestor | - |
| InventoryItem.category | UseExtensionFromAncestor | - |
| InventoryItem.code | UseExtensionFromAncestor | - |
| InventoryItem.name | UseExtensionFromAncestor | - |
| InventoryItem.name.id | UseExtensionFromAncestor | - |
| InventoryItem.name.extension | UseExtensionFromAncestor | - |
| InventoryItem.name.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.name.nameType | UseExtensionFromAncestor | - |
| InventoryItem.name.language | UseExtensionFromAncestor | - |
| InventoryItem.name.name | UseExtensionFromAncestor | - |
| InventoryItem.responsibleOrganization | UseExtensionFromAncestor | - |
| InventoryItem.responsibleOrganization.id | UseExtensionFromAncestor | - |
| InventoryItem.responsibleOrganization.extension | UseExtensionFromAncestor | - |
| InventoryItem.responsibleOrganization.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.responsibleOrganization.role | UseExtensionFromAncestor | - |
| InventoryItem.responsibleOrganization.organization | UseExtensionFromAncestor | - |
| InventoryItem.description | UseExtensionFromAncestor | - |
| InventoryItem.description.id | UseExtensionFromAncestor | - |
| InventoryItem.description.extension | UseExtensionFromAncestor | - |
| InventoryItem.description.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.description.language | UseExtensionFromAncestor | - |
| InventoryItem.description.description | UseExtensionFromAncestor | - |
| InventoryItem.inventoryStatus | UseExtensionFromAncestor | - |
| InventoryItem.baseUnit | UseExtensionFromAncestor | - |
| InventoryItem.netContent | UseExtensionFromAncestor | - |
| InventoryItem.association | UseExtensionFromAncestor | - |
| InventoryItem.association.id | UseExtensionFromAncestor | - |
| InventoryItem.association.extension | UseExtensionFromAncestor | - |
| InventoryItem.association.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.association.associationType | UseExtensionFromAncestor | - |
| InventoryItem.association.relatedItem | UseExtensionFromAncestor | - |
| InventoryItem.association.quantity | UseExtensionFromAncestor | - |
| InventoryItem.characteristic | UseExtensionFromAncestor | - |
| InventoryItem.characteristic.id | UseExtensionFromAncestor | - |
| InventoryItem.characteristic.extension | UseExtensionFromAncestor | - |
| InventoryItem.characteristic.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.characteristic.characteristicType | UseExtensionFromAncestor | - |
| InventoryItem.characteristic.value[x] | UseExtensionFromAncestor | - |
| InventoryItem.instance | UseExtensionFromAncestor | - |
| InventoryItem.instance.id | UseExtensionFromAncestor | - |
| InventoryItem.instance.extension | UseExtensionFromAncestor | - |
| InventoryItem.instance.modifierExtension | UseExtensionFromAncestor | - |
| InventoryItem.instance.identifier | UseExtensionFromAncestor | - |
| InventoryItem.instance.lotNumber | UseExtensionFromAncestor | - |
| InventoryItem.instance.expiry | UseExtensionFromAncestor | - |
| InventoryItem.instance.subject | UseExtensionFromAncestor | - |
| InventoryItem.instance.location | UseExtensionFromAncestor | - |
| InventoryItem.productReference | UseExtensionFromAncestor | - |