regarding baseline date

i want to show the base line date is unchangeble.how can i do that , for the base line date where can i supress.one of our friends told me regarding baseline date, you can supress by selecting FSG, or validations and parameter ID.

but i have tried the above scenarios , it is not showing any field in account groups,postingkeys and field status groups. and in the validations also it is not showing any baseline date. and in the parameter id it is not showing any parameter id for the baselind date.if i supress user cannot change that date.

please help me