--- title: Composite model object from another layer (Business Rule) description: This business rule warns when a Mart Composite or a Mart Hierarchy Flatten reads a composite model object of another layer in a dataflow set. --- [Skip to content](https://knowledge.bigenius-x.com/composite-model-object-from-another-layer-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) # Composite model object from another layer (Business Rule) **Applies to** Platform: Microsoft SQL Server · Snowflake · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Architecture: Data Mart This business rule warns when a Mart Composite or a Mart Hierarchy Flatten reads a composite model object of another layer in a dataflow set. The generator still writes the model object. The message suggests a Vault Out as source instead. ### Message Warning ID-21002, short text `Model object uses a composite model object from another layer in a dataflow set.`, details: ``` Model object '' of type 'Mart Composite' uses a composite model object from another layer in a dataflow set. This will be disallowed in the future and should be refactored (e.g. use the corresponding Vault Out model object instead). ``` Available since Generator 2.2. ### Cause A dataflow set of the Mart Composite or Mart Hierarchy Flatten has a RawVault Composite, BusinessVault Composite, Core Composite or Store Composite as source. These composites belong to the Raw Vault, Business Vault, Core and Store layers. ### Fix 1. For a RawVault Composite or BusinessVault Composite, create a [Vault Out](https://knowledge.bigenius-x.com/create-a-vault-out?hsLang=en) with the terms the Mart model object reads. 2. In the dataflow set of the Mart Composite or Mart Hierarchy Flatten, use the Vault Out as source instead of the composite and map the terms again. 3. Generate the artifacts again. ### Check the result The warning is gone from the Mart Composite or Mart Hierarchy Flatten. ### Example In a Vault and Mart project, the Mart Composites `common_employee`, `dataflow_multi_cached_mc` and `dataflow_multi_virtual_mc` read the BusinessVault Composite `EMPLOYEE`. Generation reports the warning once for each of the three Mart Composites, and their generated objects are still written. ### Related articles - Reference: [Mart Composite](https://knowledge.bigenius-x.com/create-a-mart-composite?hsLang=en), [Vault Out](https://knowledge.bigenius-x.com/create-a-vault-out?hsLang=en) - See also: [Understand warnings and errors](https://knowledge.bigenius-x.com/understand-warnings-and-errors?hsLang=en), [Troubleshoot generation, deployment and load failures](https://knowledge.bigenius-x.com/troubleshoot-generation-deployment-and-load-failures?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) - [General overview](https://knowledge.bigenius-x.com/general-overview?hsLang=en) - 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