diff --git a/src/libs/ifc/schema/pattern/v0.4.0.xsd b/src/libs/ifc/schema/pattern/v0.4.0.xsd
index 2467465f1..0e6db6645 100644
--- a/src/libs/ifc/schema/pattern/v0.4.0.xsd
+++ b/src/libs/ifc/schema/pattern/v0.4.0.xsd
@@ -420,14 +420,14 @@
                                   <xs:element name="csa" minOccurs="0" maxOccurs="1">
                                     <xs:complexType>
                                       <xs:sequence>
-                                        <xs:element name="child" type="xs:unsignedInt" minOccurs="1" maxOccurs="unbounded"/>
+                                        <xs:element name="child" type="xs:unsignedInt" minOccurs="0" maxOccurs="unbounded"/>
                                       </xs:sequence>
                                     </xs:complexType>
                                   </xs:element>
                                   <xs:element name="iPaths" minOccurs="0" maxOccurs="1">
                                     <xs:complexType>
                                       <xs:sequence>
-                                        <xs:element name="child" type="xs:unsignedInt" minOccurs="1" maxOccurs="unbounded"/>
+                                        <xs:element name="child" type="xs:unsignedInt" minOccurs="0" maxOccurs="unbounded"/>
                                       </xs:sequence>
                                     </xs:complexType>
                                   </xs:element>
diff --git a/src/libs/vtools/tools/vtooluniondetails.cpp b/src/libs/vtools/tools/vtooluniondetails.cpp
index 22d1c157e..c78cc2444 100644
--- a/src/libs/vtools/tools/vtooluniondetails.cpp
+++ b/src/libs/vtools/tools/vtooluniondetails.cpp
@@ -621,14 +621,17 @@ QDomElement GetTagChildren(VAbstractPattern *doc, quint32 id)
 //---------------------------------------------------------------------------------------------------------------------
 void SaveChildren(VAbstractPattern *doc, quint32 id, QDomElement section, const QVector<quint32> &children)
 {
-    for (int i=0; i<children.size(); ++i)
+    if (children.size() > 0)
     {
-        QDomElement tagChild = doc->createElement(VToolUnionDetails::TagChild);
-        tagChild.appendChild(doc->createTextNode(QString().setNum(children.at(i))));
-        section.appendChild(tagChild);
-    }
+        for (int i=0; i<children.size(); ++i)
+        {
+            QDomElement tagChild = doc->createElement(VToolUnionDetails::TagChild);
+            tagChild.appendChild(doc->createTextNode(QString().setNum(children.at(i))));
+            section.appendChild(tagChild);
+        }
 
-    GetTagChildren(doc, id).appendChild(section);
+        GetTagChildren(doc, id).appendChild(section);
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------