Add RN

Author: adam-dupaski

content/en/docs/releasenotes/studio-pro/8/8.18.md

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 This is the [LTS](/releasenotes/studio-pro/lts-mts/#lts) version 8 release for apps in production.
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+## 8.18.26 {#81826}
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+**Release date: September __, 2023**
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+{{% button color="info" href="https://marketplace.mendix.com/link/studiopro/8.18.26" text="Go to Marketplace" title="Download version 8.18.26 from the Marketplace" %}}
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+### Fixes
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+* We fixed an issue in the $metadata of published OData services using OData version 3 where a self-referencing association could result in two roles with the same name (Ticket 193467).
+
+### Deprecations
+
+* We will drop support for PostgreSQL 11 after November 1, 2023, as it is no longer supported by the vendor.
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 ## 8.18.25 {#81825}
 
 **Release date: July 6, 2023**