Piet,
sorry, I did not know, that you have a 2-way system. I have a BS 7000 myself. But if BS 7000 and LCs are in the same room, you don`t need link-commands.
Try 1:000:LIGHT:CIFFER_9 - "1" on the top of the code is "LINK" ...I am not really sure, because I didn`t test Link-Light codes.
Good Luck
Stefan