# Rule Based Routing

## Overview

* In many real-world integrations, a single entity type in the source system may need to synchronize with different entity types in the target system based on the value of a specific field — such as Request Type, Category, or Type.
* Even though the source entity type remains the same, its business means changes when that field’s value changes. In such cases, the target entity type should update automatically without creating duplicates, ensuring both systems stay consistent.

This need typically arises when:

* The number of entity types differs between the source and target systems.
* A classification or partitioning field determines how the entity should behave (e.g., Bug, Feature Request, Change Request).
* Entities are created from both systems, and entity type changes must remain synchronized in both directions.

## Example Use Case

Consider a source system where all items are created as a Request, and the field **requestType** determines the entity type to be created in the target.

| **requestType Value** | **Target Entity Type** |
| --------------------- | ---------------------- |
| Bug                   | Bug                    |
| Feature Request       | Feature                |
| Change Request        | Change Request         |

**Typical Behavior:**

* When the source Request has requestType = Bug, it is synchronized as a Bug in the target system.
* If the requestType changes to Feature Request, the previously synced Bug is automatically converted to a Feature Request — without creating duplicates.
* If the entity type changes on the target side, the requestType field in the source system updates automatically to stay aligned.

<code class="expression">space.vars.SITENAME</code> allows seamless conversion when the routing field value changes and automatically updates the corresponding target entity type. It also ensures that when updates flow in the reverse direction, the source field value is adjusted accordingly—maintaining complete bidirectional consistency. For more details about configuration, refer to this section: [Routing Rules Configuration](https://docs.opshub.com/v7.220/configure-integrations/integration-configuration#rule-based-routing).


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