diff --git a/public/FWEBuilding/v2.1/XSD/FWEBuilding.xsd b/public/FWEBuilding/v2.1/XSD/FWEBuilding.xsd
index da8b63614661c6028e6eda31a2bff1d48d42355c..ea4a663636108aca2011957ff1299b43354e202a 100644
--- a/public/FWEBuilding/v2.1/XSD/FWEBuilding.xsd
+++ b/public/FWEBuilding/v2.1/XSD/FWEBuilding.xsd
@@ -166,6 +166,11 @@
     </annotation>
   </element>
   <element name="buildingSurveyProperties" substitutionGroup="bldg:_GenericApplicationPropertyOfAbstractBuilding">
+    <annotation>
+      <appinfo>
+        <taggedValue xmlns="http://www.interactive-instruments.de/ShapeChange/AppInfo" tag="relationType">composition</taggedValue>
+      </appinfo>
+    </annotation>
     <complexType>
       <sequence>
         <element ref="FWEB:BuildingSurvey"/>