[castor-dev] Force an element to be marshalled

Is there any way to force an element to be marshalled to XML even if the field in the Java object is null or empty? 

I am marshalling XML to a remote web service that requires a CostCenter field in the XML, even if that field is null. Here is an example of the XML that is being produced: 

<?xml version="1.0" encoding="UTF-8"?>
<Order>
<LineItem><ItemNumber>124029</ItemNumber><ItemQty>1</ItemQty><CostCenter>1234567.1234.123</CostCenter></LineItem>
<LineItem><ItemNumber>122094</ItemNumber><ItemQty>1</ItemQty></LineItem>
<LineItem><ItemNumber>119106</ItemNumber><ItemQty>1</ItemQty></LineItem>
<LineItem><ItemNumber>119105</ItemNumber><ItemQty>1</ItemQty></LineItem>
</Order>

Only the first <LineItem> includes the <CostCenter> element, but I need all of them to include it, even if it is an empty item i.e. <CostCenter></CostCenter>

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