diff --git a/modules/gui/src/com/haulmont/cuba/gui/window.xsd b/modules/gui/src/com/haulmont/cuba/gui/window.xsd
index 626d70c08f..e43caa47a9 100644
--- a/modules/gui/src/com/haulmont/cuba/gui/window.xsd
+++ b/modules/gui/src/com/haulmont/cuba/gui/window.xsd
@@ -1122,7 +1122,6 @@
     <!-- CollectionDatasource -->
     <xs:complexType name="collectionDatasourceType">
         <xs:sequence>
-            <xs:element name="dataserviceClass" minOccurs="0" maxOccurs="1"/>
             <xs:element name="query" minOccurs="0" maxOccurs="1">
                 <xs:complexType mixed="true">
                     <xs:sequence>
@@ -1143,7 +1142,6 @@
     <!-- HierarchicalDatasource -->
     <xs:complexType name="hierarchicalDatasourceType">
         <xs:sequence>
-            <xs:element name="dataserviceClass" minOccurs="0" maxOccurs="1"/>
             <xs:element name="query" minOccurs="0" maxOccurs="1">
                 <xs:complexType mixed="true">
                     <xs:sequence>
@@ -1165,7 +1163,6 @@
     <!-- GroupDatasource -->
     <xs:complexType name="groupDatasourceType">
         <xs:sequence>
-            <xs:element name="dataserviceClass" minOccurs="0" maxOccurs="1"/>
             <xs:element name="query" minOccurs="0" maxOccurs="1">
                 <xs:complexType mixed="true">
                     <xs:sequence>