diff --git a/repository/src/main/resources/xsd/repositorytypes.xsd b/repository/src/main/resources/xsd/repositorytypes.xsd
index f3932bb..32bdd06 100644
--- a/repository/src/main/resources/xsd/repositorytypes.xsd
+++ b/repository/src/main/resources/xsd/repositorytypes.xsd
@@ -135,6 +135,7 @@
 			<xs:element name="annotation" type="fixr:annotation" minOccurs="0"/>
 		</xs:sequence>
 		<xs:attributeGroup ref="fixr:oidGrp"/>
+		<xs:attributeGroup ref="fixr:scenarioRefGrp"/>
 		<xs:attribute name="type" type="fixr:Name_t" use="required">
 			<xs:annotation>
 				<xs:documentation>Underlying FIX datatype of codes
@@ -225,6 +226,7 @@
 		</xs:sequence>
 		<xs:attributeGroup ref="fixr:entityAttribGrp"/>
 		<xs:attributeGroup ref="fixr:oidGrp"/>
+		<xs:attributeGroup ref="fixr:scenarioRefGrp"/>
 		<xs:attribute name="category" type="fixr:Name_t"/>
 		<xs:attribute name="rendering" type="xs:string">
 			<xs:annotation>
@@ -568,6 +570,7 @@
 		</xs:sequence>
 		<xs:attributeGroup ref="fixr:entityAttribGrp"/>
 		<xs:attributeGroup ref="fixr:oidGrp"/>
+		<xs:attributeGroup ref="fixr:scenarioRefGrp"/>
 		<xs:attribute name="category" type="fixr:Name_t"/>
 		<xs:attribute name="rendering" type="xs:string">
 			<xs:annotation>
@@ -739,6 +742,7 @@
 		<xs:attribute name="msgType" type="fixr:MsgType_t"/>
 		<xs:attribute name="category" type="fixr:Name_t"/>
 		<xs:attributeGroup ref="fixr:oidGrp"/>
+		<xs:attributeGroup ref="fixr:scenarioRefGrp"/>
 		<xs:attributeGroup ref="fixr:entityAttribGrp"/>
 		<xs:attribute name="flow" type="fixr:Name_t"/>
 		<xs:attribute name="rendering" type="xs:string">
@@ -901,6 +905,21 @@
 			</xs:annotation>
 		</xs:attribute>
 	</xs:attributeGroup>
+	<xs:attributeGroup name="scenarioRefGrp">
+		<xs:annotation>
+			<xs:documentation>A reference to a scenario by its key identifiers. There are no defaults as scenario references are optional.</xs:documentation>
+		</xs:annotation>
+		<xs:attribute name="scenarioRefId" type="fixr:id_t" use="required">
+			<xs:annotation>
+				<xs:documentation>Unique identifier of a scenario. Default is '1' for base scenario.</xs:documentation>
+			</xs:annotation>
+		</xs:attribute>
+		<xs:attribute name="scenarioRef" type="fixr:Name_t">
+			<xs:annotation>
+				<xs:documentation>Name of a scenario. The name is optional as part of a reference and only for convenience.</xs:documentation>
+			</xs:annotation>
+		</xs:attribute>
+	</xs:attributeGroup>
 	<xs:simpleType name="reliability_t">
 		<xs:annotation>
 			<xs:documentation>Message delivery gurantee</xs:documentation>