Hello Daniel,
I did all that: removed the whole classlib and recreated again. In fact, I wasn't able to add the property either, it's not available. Other classes seems to work, like forms and stuff but BizObj not. I don't think it's a MM issue myself because the KBizObj works and we can modify all methods but can't add anything. Well, we postponed this problem for now and added two methods directly to the base KBizOBj.
Thank you for your help.
Igor