The Transclusion Macro from the projectdoc Toolbox transcludes content that is marked with the Section and Content Marker Macro. If you transclude sections on a page, these sections are not seen by a transclusion macro of another page.

One solution to this problem is to place the transclusion macro inside a section. But this adjusts the section heading level, which may not be what you want. The other solution is to set the transclusion macro inside a content marker macro. This will transclude the content from theother page without adding one to the heading level.