DOCBOOK: ToC Page numbers

Title: ToC Page numbers

Hi

I've now created my first DocBook document and I wish I'd discovered DocBook years ago - it's great!

One small issue I cannot resolve. 

My document is organised

book

 preface

 chapter

  section

  section

 chapter

.

.

The Toc is displaying page entries for preface, chapter and section element, which is fine. However, only the section entries are generating correct page numbers. The preface and chapters are not generating numbers at all.

I've looked at the docbook installation fo and params directories but it's a bit bewildering at the moment.

BTW I'm using docbook-xsl-1.50.0, fop.0.20.3

Can anyone help?

Regards

Mark