Chapter numbers miss from document due to not formatted for chapter number.
Cause:
At least one section in the document is not formatted for chapter page numbering. All sections must be formatted in this way or chapter page numbering will not appear.
Solution:
Open the master document and select all text. Select the 'Include Chapter Number' box in the Page Number Format dialog box.
1) Open the master document.
2) Select the 'Edit' menu and select 'Select All'.
3) Select the 'Insert' menu and select 'Page Numbers...'.
4) Click 'Format...'.
5) Select the 'Include Chapter Number' check box.
6) Select the heading style in the 'Chapter Starts With Style' drop-down list box.
7) (Optional) Select a separator from the 'Use Separator' drop-down list box.
8) Click 'OK' twice to return to the document.