Table inherited from task - inherited fields

Hi

I have created a table inherited from task. unfortunately when I look at the default form for this table, I cannot see the comments and work notes column unless logged in as admin. 

I have added role with ACL entries to specifically give access to the column and that works. My question is what are the default settings for columns from inherited tables? I tried an ACL for the entire table and that never worked.

For example

I inherit from task to create table "training task". I add an ACL for the whole training task table to give read access. Why does that not give access to the inherited "task.comments and work notes" column?

thanks in advance

Regards

ian