--- schema_version: "1" id: 6c5e78d55c716d12d028ffbe12bf97a0153c2dcd51916fd7701bccbde6293522 title: KnowledgeArticleVersionHistory collection: legacydeveloper version: current locale: en-us portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/object_reference/sforce_api_objects_knowledgearticleversionhistory.md canonical_url: https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_knowledgearticleversionhistory.htm source_site: developer.salesforce.com content_type: documentation content_hash: 4416325308dcf17d24185d5dfc33a003ccf759a2152f46e24c63511737710f0d description: Enables read-only access to the full history of an article. This object is available in API version 25.0 and later. --- # KnowledgeArticleVersionHistory Enables read-only access to the full history of an article. This object is available in API version 25.0 and later. Knowledge\_\_VersionHistory is derived from this object. To access this derived object, [turn on field history tracking](https://help.salesforce.com/articleView?id=tracking_field_history_for_custom_objects.htm&type=5&language=en_US) for Knowledge objects. ## Supported Calls describeSObjects(), getDeleted(), getUpdated(), query(), retrieve() You can also enable delete() in API version 42.0 and later. See [Enable delete of Field History and Field History Archive](https://help.salesforce.com/articleView?id=000321814&type=1&mode=1&language=en_US "HTML (New Window)"). ## Special Access Rules Knowledge must be enabled in your org. This object respects field, entity, and record-level security. You must have at least “Read” permission on the article type or the field to access its history. For data category security, Salesforce determines access based on the categorization of the online version of an article. If there’s no online version, then security is applied based on the archived version, followed by the security of the draft version. ## Fields | Field Name | Details | | --- | --- | | DataType | Type picklist Properties Filter, Group, Restricted picklist, Sort Description The type of data that is tracked in the history table. This field is available in API version 50.0 and later. | | EventType | Type picklist Properties Filter, Group, Restricted picklist, Sort Description The type of event that is tracked in the history table. | | FieldName | Type picklist Properties Filter, Group, Nillable, Restricted picklist, Sort Description Name of the tracked field. | | Language | Type picklist Properties Filter, Group, Restricted picklist, Sort Description The language that the article is written in, such as French or Chinese (Traditional). Querying or searching articles in SOSL requires that you specify the Language field in the WHERE clause. The language must be the same for all article types. | | NewValue | Type anyType Properties Nillable, Sort Description The new value of the field that was changed. | | OldValue | Type anyType Properties Nillable, Sort Description The most recent value of the field before it was changed. | | ParentId | Type reference Properties Filter, Group, Sort Description The ID of the article. | | ParentSobjectType | Type picklist Properties Filter, Group, Restricted picklist, Sort Description The type of object that contains the field. | | VersionId | Type reference Properties Filter, Group, Nillable, Sort Description The ID assigned to a version of the article. This is a polymorphic relationship field. | | VersionNumber | Type int Properties Filter, Group, Sort Description The number assigned to a version of an article. This field is available in API version 24.0 and later. | ## Usage Use this object to query events in the history of an article. For example, you can retrieve the number of edits a particular user has made to an article, how many times the article has been published, and so on.