Sync song mode from rytm <> analog keys / four

Hey guys, i programmed a sequence on my rytm (song edit mode) and i want to sync the song with my ak (both in chain mode for instance) okay it’s clear that ak does not takeover the arrangement from rytm - but if i do also an arrangement on the ak (rytm is set as midi master) and start the rytm all arrangements on keys disappear.

sorry for the explaining complexity - but i would be glad if anyone could help me out. maybe i’m totally wrong and theres another way to sync both machines to one common arrangement…

cheers sash