Importing musicxml containing ccs

When importing a musicxml file containing cc1, these ccs are reflected in Dorico in the relevant automation line, but appear grayed and not editable. How can I edit them (and/or delete them) ?

(it seems also to depend on the playback template used : with EWQL no velocities no ccs are shown (idem with VSL); with HSO velocities and cc1 are shown (not editable); with BBCSO (which I want to use here) velocities (all equal to the same value, editable), cc1 and cc11 are shown (not editable).