diff --git a/pvDataApp/factory/FieldCreateFactory.cpp b/pvDataApp/factory/FieldCreateFactory.cpp
index 4bc020f..d1c205e 100644
--- a/pvDataApp/factory/FieldCreateFactory.cpp
+++ b/pvDataApp/factory/FieldCreateFactory.cpp
@@ -362,7 +362,7 @@ StructureConstPtr FieldCreate::appendField(
     }
     newNames[oldLen] = fieldName;
     newFields[oldLen] = field;
-    return createStructure(newNames,newFields);
+    return createStructure(structure->getID(),newNames,newFields);
 }
 
 StructureConstPtr FieldCreate::appendFields(
@@ -384,7 +384,7 @@ StructureConstPtr FieldCreate::appendFields(
         newNames[oldLen +i] = fieldNames[i];
         newFields[oldLen +i] = fields[i];
     }
-    return createStructure(newNames,newFields);
+    return createStructure(structure->getID(),newNames,newFields);
 }
 
 
diff --git a/pvDataApp/factory/PVStructure.cpp b/pvDataApp/factory/PVStructure.cpp
index 1f4c534..9e6b084 100644
--- a/pvDataApp/factory/PVStructure.cpp
+++ b/pvDataApp/factory/PVStructure.cpp
@@ -193,7 +193,7 @@ void PVStructure::removePVField(String fieldName)
     }
     PVFieldPtrArray * xxx = const_cast<PVFieldPtrArray *>(&pvFields);
     xxx->swap(newPVFields);
-    FieldConstPtr field = getFieldCreate()->createStructure(newFieldNames,fields);
+    FieldConstPtr field = getFieldCreate()->createStructure(structurePtr->getID(),newFieldNames,fields);
     replaceField(field);
     structurePtr = static_pointer_cast<const Structure>(field);
     StringArray fieldNames = structurePtr->getFieldNames();