The end of (6.2.5) states - "A unit with a Replacement marker prevents ALL combat in the hex it occupies—not just the unit receiving the Replacement. As soon as the Replacement marker is removed in the Recovery Phase the restriction is lifted."
Just want to confirm that this means the units cannot attack or be attacked?
Keep the SoP in mind...recovery phase occurs after that side's combat phase, so all this means is that any HEX containing a Repl marker cannot attack. The marker is removed before the other side's next move+attack, so does not prevent them from being attacked.