The XML View produce by JIRA does not follow the expected result as describe here. This is tested and reproduceable in JIRA 4.2, 4.3 and 4.4.

Steps to replicate:

1. create versions in a project
2. create one Version Picker type custom field
3. create one issue and choose any value in the Version Picker type custom field
4. filter issue in Issue Navigator and choose the View XML. It will display the result for the custom field:

   <customfields>
   	<customfield id="customfield_10000" key="com.atlassian.jira.plugin.system.customfieldtypes:version">
   	<customfieldname>versionpicker</customfieldname>
   	<customfieldvalues><customfieldvalue>10000</customfieldvalue></customfieldvalues>
   	</customfield>
   </customfields>