Brendan was telling us:
Brendan nous racontait que :

Unless the sections that need protecting are change dynamically, you do not
need this line in your code.

Just manually assign which section needs protection when you create the
template, then only use

   ActiveDocument.Unprotect

to protect/unprotect the whole document. Only the sections  labelled as "To
be protected" will be affected.

Brendan was telling us:
Brendan nous racontait que :

As I wrote in my other reply in this thread, if you set up your template
properly, all you need is
   ActiveDocument.Unprotect

Now, in your code, you are unprotecting the document.
May I ask why?
Also, you are not re-protecting it, so of course, section 1 is now
unprotected.

I have the feeling that all you want to do is send the user to the beginning
of the editable part of the document when they are done typing in the
formfields. If this is the case, then you do not need a macro.
Just protect section 1 (and not section 2) and then the cursor will
automatically go to the beginning of section 2 when they tab out of the last
field in section 1.

Now, if you really need a macro, try this:

Sub macGoToBMPropNarr()
   Application.OnTime When:=Now, Name:="ReallymacGoToBMPropNarr"
End Sub

Sub ReallymacGoToBMPropNarr()
   If ActiveDocument.Bookmarks.Exists("swPropNarr") Then
       ActiveDocument.Bookmarks("swPropNarr").Select
   End If
End Sub

It seems that without the macro to call another macro, Word will not
properly get to the bookmark.