--- title: Model object type not supported on Fabric Warehouse (Business Rule) description: This business rule warns when a project for Fabric Warehouse contains a Hierarchy Flatten or a Mart Hierarchy Flatten, which the platform does not support. --- [Skip to content](https://knowledge.bigenius-x.com/model-object-type-not-supported-on-fabric-warehouse-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) # Model object type not supported on Fabric Warehouse (Business Rule) **Applies to** Platform: Fabric Warehouse Architecture: Data Vault · Data Mart This business rule warns when a project for Fabric Warehouse contains a Hierarchy Flatten or a Mart Hierarchy Flatten, which the platform does not support. It raises a warning, and generation continues. The rule ID is ID-35003. ### Message The client shows a warning with this text on the model object. `` and `` stand for its name and type. ``` Model object '' of type '' is not supported for the Fabric Warehouse platform. Fabric Warehouse uses Synapse SQL, which currently does not support the required recursive common table expressions. ``` On the model object card, point to the warning icon to see this message with the rule ID: Warning ID-35003. The Generate Artifacts page lists the message without the ID. Available since Generator 2.2. ### Cause The model object is a Hierarchy Flatten or a Mart Hierarchy Flatten. Both types build their result with a recursive common table expression, which Fabric Warehouse does not support. The rule also checks deactivated model objects of these types. Despite the warning, the generator writes an active model object of these types into the artifacts, with its deployment and load code. ### Fix 1. Delete the model object from the Fabric Warehouse project, see [Delete a Model Object](https://knowledge.bigenius-x.com/delete-a-model-object?hsLang=en). Deactivating it does not remove the warning. 2. Give each model object that read from it another source. ### Check the result The warning icon is gone, and the project contains no Hierarchy Flatten or Mart Hierarchy Flatten. ### Example In a Data Mart project on Fabric Warehouse, the Mart Hierarchy Flatten `load_mart_hierarchy_flatten` is active. The client shows: ``` Model object 'load_mart_hierarchy_flatten' of type 'Mart Hierarchy Flatten' is not supported for the Fabric Warehouse platform. Fabric Warehouse uses Synapse SQL, which currently does not support the required recursive common table expressions. ``` The deactivated Mart Hierarchy Flatten `load_mart_hierarchy_flatten_deactivated` of the same project shows the same warning with its own name. ### Related articles - Reference: [Delete a Model Object](https://knowledge.bigenius-x.com/delete-a-model-object?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) - 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