Event filter

[PvanIeperen]

I'm looking in to some examples regarding the event filters.
We noticed that while connecting to a server made with the open62541 library we cannot receive any events.

public SimpleAttributeOperandCollection GetSelectClause()
{
    SimpleAttributeOperandCollection selectClause = new SimpleAttributeOperandCollection();

    var operand = new SimpleAttributeOperand
    {
        TypeDefinitionId = Opc.Ua.ObjectTypeIds.BaseEventType,
        AttributeId = Attributes.NodeId
    };

     // What is the use of this first SelectClause?
    selectClause.Add(operand);

    foreach (FilterDeclarationField field in Fields)
    {
        if (field.Selected)
        {
            operand = new SimpleAttributeOperand
            {
                TypeDefinitionId = field.InstanceDeclaration.RootTypeId,
                AttributeId = (field.InstanceDeclaration.NodeClass == NodeClass.Object) ? Attributes.NodeId : Attributes.Value,
                BrowsePath = field.InstanceDeclaration.BrowsePath
            };

            selectClause.Add(operand);
        }
    }

    return selectClause;
}

When I do not add the first selectClause than I can receive events.

What is the use of the first selectClause?

Regards Patrick

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