You need to do it just like all other retrofits.
In expert mode, add $502 to your VO, then FA_WRITE to CAS & NFRM.
Then code each of your modules (still in expert mode) with the SG_CODRIEN job. (CAS, KOMBI, NFRM, JBBF, FZD etc)
Do it correctly so the next reply isn't how to fix it