--- title: dbt incremental read filter not applied (Business Rule) description: These business rules warn when BG_IncrementalFilter is mapped but the dbt incremental read filter does not use the mapping. --- [Skip to content](https://knowledge.bigenius-x.com/dbt-incremental-read-filter-not-applied-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) # dbt incremental read filter not applied (Business Rule) **Applies to** Platform: Snowflake dbt · Databricks dbt Architecture: Data Vault · Data Mart These business rules warn when `BG_IncrementalFilter` is mapped but the dbt incremental read filter does not use the mapping. A mapping to anything other than the source's `BG_LoadTimestamp` raises ID-34000, and a mapping on a Mart Fact with Fact Load Strategy `Truncate Insert` raises ID-34002. Both are warnings, and generation continues. ### Messages Each message names the model object and its type in place of `` and ``. The Generate Artifacts page lists the messages without the rule ID. #### Incremental filter not mapped to the load timestamp The client shows a warning with this text: ``` Model object '' of type '' has an incremental filter that is not mapped to the source's BG_LoadTimestamp. The dbt incremental read filter currently supports only BG_LoadTimestamp; none applied. Map BG_IncrementalFilter to the source's BG_LoadTimestamp to enable it. ``` On the model object card, point to the warning icon to see this message with the rule ID: Warning ID-34000. Cause: the expression of `BG_IncrementalFilter` does not use the `BG_LoadTimestamp` of a source of its dataflow set. The rule checks the satellite types and Mart Facts with Fact Load Strategy `Insert`. The model then reads all source rows on every run. Fix: map `BG_IncrementalFilter` to the source's `BG_LoadTimestamp` in Manage Term Mappings. When the model object should read all rows, clear the mapping instead. #### Incremental filter on a full-rebuild Mart Fact The client shows a warning with this text: ``` Model object '' of type '' is a Truncate-Insert Mart Fact with an incremental filter mapped; the dbt incremental read filter does not apply to full-rebuild facts and is not applied. ``` On the model object card, point to the warning icon to see this message with the rule ID: Warning ID-34002. Cause: a Mart Fact with Fact Load Strategy `Truncate Insert` maps `BG_IncrementalFilter`. The Mart Fact is rebuilt in full on every run. Only Databricks dbt offers Data Mart projects. Fix: clear the mapping of `BG_IncrementalFilter`. Available since Generator 2.2. ### Check the result The warning icon is gone from the model object. ### Example In a Data Mart project on Databricks dbt, the Mart Fact `deduplication_partition_mart_fact` maps `BG_IncrementalFilter` to the term `TRANSACTION_TIME` of its source. The client shows: ``` Model object 'deduplication_partition_mart_fact' of type 'Mart Fact' has an incremental filter that is not mapped to the source's BG_LoadTimestamp. The dbt incremental read filter currently supports only BG_LoadTimestamp; none applied. Map BG_IncrementalFilter to the source's BG_LoadTimestamp to enable it. ``` ### Related articles - Reference: [BG\_IncrementalFilter](https://knowledge.bigenius-x.com/bg_incrementalfilter?hsLang=en), [Fact Load Strategy (Dataflow)](https://knowledge.bigenius-x.com/fact-load-strategy-dataflow?hsLang=en) - See also: [dbt - Deployment](https://knowledge.bigenius-x.com/dbt-deployment?hsLang=en#load-new-source-data), [Configure an incremental load](https://knowledge.bigenius-x.com/configure-an-incremental-load?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) - [General overview](https://knowledge.bigenius-x.com/general-overview?hsLang=en) - 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