--- title: Implementation Type Dataflows amount (Business Rule) description: This business rule checks that a model object with Implementation Type Virtual has only one dataflow. --- [Skip to content](https://knowledge.bigenius-x.com/implementation-type-dataflows-amount-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) # Implementation Type Dataflows amount (Business Rule) **Applies to** Platform: Microsoft SQL Server · Snowflake · Snowflake dbt · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Architecture: Data Store · Data Vault · Dimensional · Data Mart This business rule checks that a model object with Implementation Type `Virtual` has only one dataflow. It raises an error, which blocks generation in the client until you fix it. The rule ID is ID-10019. ### Message The client shows an error with this text on the model object. `` and `` stand for its name and type. ``` Model object '' of type '' has implementation type 'Virtual' and more then one dataflow defined. This is only supported with implementation type 'Permanent', 'FactLoadStrategy' or 'Cached'. ``` On the model object card, point to the error icon to see this message with the rule ID: Error ID-10019. The Generate Artifacts page lists the message without the ID. ![Error popup of a RawVault Composite card with Error ID-10019 and the message details](https://knowledge.bigenius-x.com/hs-fs/hubfs/image-png-Sep-18-2024-01-58-40-7249-PM.png?width=639&height=172&name=image-png-Sep-18-2024-01-58-40-7249-PM.png) ### Cause Implementation Type of the model object is `Virtual`, and the model object has more than one dataflow. The rule checks Store Composite, Core Composite, Mart Composite, Mart Out, Reference Table, RawVault Composite, BusinessVault Composite and Vault Out. On these types the same configuration also raises [Dataflows amount (Business Rule)](https://knowledge.bigenius-x.com/dataflows-amount-business-rule?hsLang=en) or [Supported Implementation Types (Business Rule)](https://knowledge.bigenius-x.com/supported-implementation-types-business-rule?hsLang=en). ### Fix - Composites, Mart Out and Vault Out: delete the extra dataflows so that one remains, see [Delete a Dataflow](https://knowledge.bigenius-x.com/delete-a-data-flow?hsLang=en). These types allow only one dataflow, also with Implementation Type `Cached`. - Reference Table: set Implementation Type to `Permanent`, see [Implementation Type (Model Object)](https://knowledge.bigenius-x.com/implementation-type-model-object?hsLang=en). ### Check the result The error icon is gone from the model object, and generation is no longer blocked by it. ### Example In a Data Mart project on Microsoft SQL Server, the Mart Out `dataflow_multi_virtual_mo` has Implementation Type `Virtual` and gets a second dataflow. The client shows: ``` Model object 'dataflow_multi_virtual_mo' of type 'Mart Out' has implementation type 'Virtual' and more then one dataflow defined. This is only supported with implementation type 'Permanent', 'FactLoadStrategy' or 'Cached'. ``` ### Related articles - Reference: [Implementation Type (Model Object)](https://knowledge.bigenius-x.com/implementation-type-model-object?hsLang=en) - See also: [Delete a Dataflow](https://knowledge.bigenius-x.com/delete-a-data-flow?hsLang=en), [Dataflows amount (Business Rule)](https://knowledge.bigenius-x.com/dataflows-amount-business-rule?hsLang=en), [Supported Implementation Types (Business Rule)](https://knowledge.bigenius-x.com/supported-implementation-types-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) - [Account](https://knowledge.bigenius-x.com/getting-started?hsLang=en#account) - 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