## 7 Constraints for Joule
All constraints applicable to Joule are listed in this section. These constrains will provide you better understandability of Joule.
The following constraints apply for Joule:
- A Single Joule subscription can be integrated into multiple SAP products like SAP SuccessFactors, SAP S/4HANA Cloud Private Edition, however, one subscription of the Joule application can be integrated with only one tenant of an SAP product. This means you cannot include multiple systems of same product in one Joule formation. Data isolation happens at tenant level.
- If you have created the NavigationService destination manually, then the subscription of Joule must be created in the same subaccount where the subscription and service instance of SAP Build Work Zone exists. For more information, see Prerequisites [page 17].
- Joule requires a trust configuration of type OpenID Connect with your Identity Authentication tenant. SAML based trust is not supported.
- The domain of the Identity Authentication tenant used for setting up trust configuration in SAP BTP subaccount should be same as the IAS domain for the SAP product.
- It is not possible to create trust to the same Identity Authentication tenant based on SAML and OIDC in parallel. If you have to set up SAML trust to your application, you can create the Joule subscription in a different subaccount and set up OIDC trust with the same IAS tenant that is linked with the application.
##  Note
The domain of the Identity Authentication tenant used for setting up trust configuration in the SAP BTP subaccount should be the same as the IAS domain used for integration with the parent SAP product.
- Joule uses SAP Build Work Zone, standard edition with foundation plan for navigational scenarios. This implies that Identity Provisioning Service (IPS) must be enabled and configured for user assignment to the navigation content.
- Users can send up to three thousand requests per minute to Joule. Once the rate limit is reached, any subsequent requests will return an error code until enough time has passed for the call count to drop below the limit.
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