Hi,
Please find herewith the details as below :
if you want to lock access for all the activies then do the setting after seeting S_RS_ADMWB in role as below.
object = S_RS_ADMWB
Field Name = ACTVT
Select ONLY (03) display.
object = S_RS_ADMWB
Field Name = RSADMWBOBJ
select all the activities.
In object changeability, the is option is available to change the object by selecting individual object (ex. if you want to change "Broadcasting Settings" then need to get access for BR_SETTING Broadcasting Settings)
hope this information is helpful for you.
regards,