The document PHO-0387-S2-2-0-xxx is a so-called MASTER document with both own content and sub-documents.
When opening this document, the subdocuments are not shown but represented as HYPERLINKS
In order to show the sub-documents, klick on menu VIEW -> Outline (in block "Views") -> Expand Subdocuments (in block "Master document).
Afterwards, close the Outline view.