Auto numbering in TOC tags

I am creating books that use auto numbering in the headings.

For example:

1.0 Introduction
2.0 First chapter
2.1 First topic
2.2 Second topic
2.2.1 Sub topic 1

When I generate the TOC, the numbers do not appear. I do not see any information in the User's Guide.

I am using Framemaker 7.2.

Any suggestions?