--- title: Current View and History View sources (Business Rule) description: These business rules check the source model objects in a dataflow set of a Current View or History View, including the Business variants. --- [Skip to content](https://knowledge.bigenius-x.com/current-view-and-history-view-sources-business-rule#main-content) [Contact us](https://knowledge.bigenius-x.com/kb-tickets/new?hsLang=en) [Go to Customer Portal](https://knowledge.bigenius-x.com/customer-portal?hsLang=en) [![TRI\_Logo\_biGENIUS\_2020\_RGB\_s](https://knowledge.bigenius-x.com/hs-fs/hubfs/Marketing/TRI_Logo_biGENIUS_2020_RGB_s.png?width=150&height=42&name=TRI_Logo_biGENIUS_2020_RGB_s.png)](https://www.bigenius-x.com/) Open main navigation Close main navigation - [Contact us](https://knowledge.bigenius-x.com/kb-tickets/new) - [Go to Customer Portal](https://knowledge.bigenius-x.com/customer-portal) How can we help you? - There are no suggestions because the search field is empty. 1. [biGENIUS-X Knowledge Base](https://knowledge.bigenius-x.com/?hsLang=en) 2. [Best practices](https://knowledge.bigenius-x.com/best-practices?hsLang=en) 3. [Business Rules](https://knowledge.bigenius-x.com/best-practices?hsLang=en#business-rules) # Current View and History View sources (Business Rule) **Applies to** Platform: Microsoft SQL Server · Snowflake · Snowflake dbt · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Architecture: Data Vault These business rules check the source model objects in a dataflow set of a Current View or History View, including the Business variants. A dataflow set may have at most one PIT, needs exactly one satellite when it has no PIT, and may have no PIT when it maps the hash key of a Driving Key Link. Each rule raises an error, which blocks generation in the client: ID-20002, ID-20003 and ID-20005. ### Messages Each message names the view and its type in place of `` and ``. The Generate Artifacts page lists the messages without the rule ID. #### More than one PIT The client shows an error with this text. For a Business Current View or Business History View, the details name Business PIT. ``` Model object '' of type '' can have 0 or 1 source model objects of type PIT . ``` On the model object card, point to the error icon to see this message with the rule ID: Error ID-20002. Cause: a dataflow set of the view has two or more PIT sources. Fix: keep one PIT in the dataflow set and remove the others. #### No PIT and not exactly one satellite The client shows an error with this text: ``` Model object '' of type '' can have exactly 1 Source Model Object of type Satellite when no Model Object of type of type PIT is used. ``` On the model object card, point to the error icon to see this message with the rule ID: Error ID-20003. Cause: a dataflow set without a PIT has no satellite source or more than one. Satellites here are Satellite, Link Satellite and their Effectivity and Business variants. Fix: keep exactly one satellite in the dataflow set, or read the satellites through a PIT. #### Driving Key Link with a PIT The client shows an error with this text. An Oracle rule uses the same ID, see [Oracle - Parallel degree and hash group size values (Business Rule)](https://knowledge.bigenius-x.com/oracle-parallel-degree-and-hash-group-size-values-business-rule?hsLang=en); the details tell them apart. ``` Model object '' of type '' can not have source model objects of type PIT , if a Driving Key Hash Key is used. Please contact our support. ``` On the model object card, point to the error icon to see this message with the rule ID: Error ID-20005. Cause: a dataflow set has a Driving Key Link or Business Driving Key Link as source, maps its `DrivingKeyLink_HK`, and also has a PIT source. Fix: remove the PIT from the dataflow set and read one satellite, or remove the mapping of `DrivingKeyLink_HK`. The message asks you to contact biGENIUS support for this combination. The Driving Key Link rule is available since Generator 2.0. ### Check the result The error icon is gone from the view, and generation is no longer blocked by it. ### Example In a Data Vault project on Microsoft SQL Server, the Current View `based_on_hub_with_pit_rcv` gets the PIT `load_based_on_lnk` as a second PIT source. The client shows: ``` Model object 'based_on_hub_with_pit_rcv' of type 'Current View' can have 0 or 1 source model objects of type PIT . ``` ### Related articles - Reference: [Current View](https://knowledge.bigenius-x.com/create-a-current-view?hsLang=en), [History View](https://knowledge.bigenius-x.com/create-a-history-view?hsLang=en), [PIT](https://knowledge.bigenius-x.com/create-a-pit?hsLang=en), [Driving Key Link](https://knowledge.bigenius-x.com/create-a-driving-key-link?hsLang=en) - See also: [Oracle - Parallel degree and hash group size values (Business Rule)](https://knowledge.bigenius-x.com/oracle-parallel-degree-and-hash-group-size-values-business-rule?hsLang=en), [Understand warnings and errors](https://knowledge.bigenius-x.com/understand-warnings-and-errors?hsLang=en) - [Getting started](https://knowledge.bigenius-x.com/getting-started?hsLang=en#main-content) - [Guidelines](https://knowledge.bigenius-x.com/getting-started?hsLang=en#guidelines) - [Start working](https://knowledge.bigenius-x.com/getting-started?hsLang=en#start-working) - 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