Different dynamics on each repeat

[Lillie_Harris]

The dynamics on either side of the separator have to be “flavours” of different dynamics:

mp-p

You can certainly do f-p etc., but not f-mf or p-mp, i.e. the two dynamics either side of the separator must be opposites: they can’t both be forte or piano. Dorico calls these “combined dynamics” and you can change their separator via Properties.