how to add Navigation title content dynamically while adding topicref in book map?

Hi,

When i insert topicref in bookmap <navtitle> content is not appearing. I am working in Arbortext,DITA SDL environment.How to enable <navtitle> content using fosi?

<topicref href="GUID-CC3EFB14-4306-48E0-BBAF-F08B49D637A8">

<topicmeta>

<navtitle></navtitle>

</topicmeta>

</topicref>

Thanks in advance

Roopesh N