diff --git a/application/applicationextension.inc.php b/application/applicationextension.inc.php
index d1aa296e4..957b359e0 100644
--- a/application/applicationextension.inc.php
+++ b/application/applicationextension.inc.php
@@ -1457,6 +1457,23 @@ interface iBackofficeStyleExtension
 	public function GetStyle(): string;
 }
 
+/**
+ * Implement this interface to add saas file (SCSS) to the backoffice pages.
+ * example: return "css/setup.scss"
+ *
+ * @api
+ * @package BackofficeUIExtensibilityAPI
+ * @since 3.3.0
+ */
+interface iBackofficeSaasExtension
+{
+	/**
+	 * @api
+	 * @see \iTopWebPage::$a_styles
+	 * @return string
+	 */
+	public function GetSaas(): string;
+}
 /**
  * Implement this interface to add Dict entries
  *
diff --git a/core/metamodel.class.php b/core/metamodel.class.php
index df39031c3..dff836711 100644
--- a/core/metamodel.class.php
+++ b/core/metamodel.class.php
@@ -7674,6 +7674,7 @@ abstract class MetaModel
 			'iBackofficeReadyScriptExtension',
 			'iBackofficeLinkedStylesheetsExtension',
 			'iBackofficeStyleExtension',
+			'iBackofficeSaasExtension',
 			'iBackofficeDictEntriesExtension',
 			'iBackofficeDictEntriesPrefixesExtension',
 			'iPortalUIExtension',
diff --git a/sources/Application/WebPage/iTopWebPage.php b/sources/Application/WebPage/iTopWebPage.php
index 66fdac763..385885b45 100644
--- a/sources/Application/WebPage/iTopWebPage.php
+++ b/sources/Application/WebPage/iTopWebPage.php
@@ -904,6 +904,11 @@ HTML;
 			$this->add_style($oExtensionInstance->GetStyle());
 		}
 
+		/** @var \iBackofficeStyleExtension $oExtensionInstance */
+		foreach (MetaModel::EnumPlugins('iBackofficeSaasExtension') as $oExtensionInstance) {
+			$this->add_saas($oExtensionInstance->GetSaas());
+		}
+
 		// TODO 3.0.0 not displayed ?
 		$this->GetContentLayout()->SetExtraHtmlContent(utils::FilterXSS($this->s_content));
 
diff --git a/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php b/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php
index 30d2341f1..5d366ec8a 100644
--- a/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php
+++ b/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php
@@ -123,6 +123,10 @@ class ApplicationExtensionTest extends ItopCustomDatamodelTestCase
 				\iBackofficeStyleExtension::class,
 				static::ENUM_API_CALL_METHOD_ENUMPLUGINS,
 			],
+			\iBackofficeSaasExtension::class => [
+				\iBackofficeSaasExtension::class,
+				static::ENUM_API_CALL_METHOD_ENUMPLUGINS,
+			],
 			\iBackofficeDictEntriesExtension::class => [
 				\iBackofficeDictEntriesExtension::class,
 				static::ENUM_API_CALL_METHOD_ENUMPLUGINS,
diff --git a/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml b/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
index c50abe52b..ae4768bae 100644
--- a/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
+++ b/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
@@ -233,6 +233,19 @@ class ExampleFor_iBackofficeStyleExtension implements \iBackofficeStyleExtension
 }
 CSS;
 	}
+}
+      ]]></content>
+    </snippet>
+    <snippet id="ExampleFor_iBackofficeSaasExtension" _delta="define">
+      <placement>core</placement>
+      <rank>0</rank>
+      <content><![CDATA[
+class ExampleFor_iBackofficeSaasExtension implements \iBackofficeSaasExtension
+{
+	public function GetSaas(): string
+	{
+		return "css/setup.scss";
+	}
 }
       ]]></content>
     </snippet>