selection="open" attribute on a selectOne element

Hi,
 
I'm trying to get a field that shows a value pulled from the database, but
then allows the user to either accept this value, or input a new value - I
had understood this was possible using the selection="open" attribute on a
selectOne element, but can't get it to work.  The field displays the value
pulled from the database, but doesn't allow me to input an alternative
value.
 
It could be that I am merely missing some code to handle the input
correctly, or something else, I'm not sure - see code snippet below:
 
       <xf:selectOne selectUI="menu" ref="/data/xmit_num" model="pagedata"
id="LPStoPSXmitNum" selection="open">
        <xf:itemset nodeset="//configset/configitem" model="existingconfig">
         <xf:caption ref="lps_to_ps_xmit_num"/>
         <xf:value ref="lps_to_ps_xmit_num"/>
        </xf:itemset>
       </xf:selectOne>
 
Any and all advice gratefully received!
Carryl

Carryl Durnell
FASTWIRE Consultant
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LogicaCMG

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Carryl.Durnell@logicacmg.com 
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