--- title: Handle missing Foreign Key in a Relationship description: Handle missing Foreign Key in a Relationship --- [Skip to content](https://knowledge.bigenius-x.com/handle-missing-foreign-key-in-a-relationship#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. [Application Modules](https://knowledge.bigenius-x.com/application-modules?hsLang=en) 3. [Dataflow Modeling - Relationships](https://knowledge.bigenius-x.com/application-modules?hsLang=en#dataflow-modeling-relationships) # Handle missing Foreign Key in a Relationship In [Edit a Relationship](https://knowledge.bigenius-x.com/edit-a-relationship?hsLang=en), we've seen that we can configure the **BK Behavior** for a **Relationship:** ![](https://knowledge.bigenius-x.com/hs-fs/hubfs/image-png-May-04-2023-12-17-54-0734-PM.png?width=597&height=307&name=image-png-May-04-2023-12-17-54-0734-PM.png) When a **Relationship** is defined between a source **Model Object** *A* and a target **Model Object** *B*, the **Foreign Key** value in **Model Object** *B* may not exist as a **Business Key** value in Model Object *A*. We are talking about missing **Foreign Keys** in a **Relationship**. You can configure four different behaviors to adopt during the load: 1. None 2. Set to Unknown 3. Create an embryo 4. Log an error and refuse ### None If we set the **BK Behavior** to *None*, the **Foreign Key** of the Model Object B will contain the singleton value for Unknown (which can differ according to the Data Type of the Foreign Key). ### Set to Unknown If we set the **BK Behavior** to *setToUnknown*, the **Foreign Key** of the Model Object B will contain the singleton value for Unknown (which can differ according to the Data Type of the Foreign Key). ### Create an embryo If we set the **BK Behavior** to *createEmbryo*, the missing value in Model Object A will be artificially created. The following graph explains how the embryo behavior works (in a Dimensional modeling example): ![blobid1](https://knowledge.bigenius-x.com/hs-fs/hubfs/blobid1.png?width=688&height=339&name=blobid1.png) - In the Sales Fact table is referenced the Product MTB 3 - The MTB 3 Product doesn't exist in the product Entity - The embryo behavior creates the MTB 3 product in the Product Entity, and the relationship between the Sales Fact and the Product Entity can be done. ### Log an error and refuse If we set the **BK Behavior** to *logErrorAndRefuse*, if the value of the **Foreign Key** on **Model Object** *B* doesn't exist in **Model Object** *A*, the load will not load this row and log an error. ### Demonstration video   - [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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