Note the following before applying read-only to
When compiling a top-level
project with a read-only include project, the object IDs of the
included projects are skipped and not changed.
Updating graphics documents
and/or pages in mid-level include projects is not recommended
because it will not update pages in the top-level project. However,
issuing an update pages at the top level iterates through included
projects recursively. (If these need to be updated, make the
relevant projects read-write first).