The point is to show in the bookmark specific sections in an international standard. I could patch around this specific issue but then am left wondering where else I might face the same issue, i.e. what are the rules that apply with Bookmarks and case-sensitivity (and length). Even if I manually add these two bookmarks one by one in Insert->Bookmark->Add they only create one bookmark. So, this is clearly "baked in" to Word. Again, just want to know the rules of the game.
I did another simple experiment. I tried creating opsafe and OPSAFE manually one-by-one (no macro). It only ended with 1 bookmark. It appears bookmarks are not case-sensitive???