I strongly agree with M.
1) never change 0-objects
2) compounding plant to customer does mako no sense at all
3) what do you mean "how to enable compound tab"? It´s always there and when you go to change mode for the info object you can add compound chars (they are not called attributes, they are characteristics)
only in case of a referencing char you will not be able to change the compounding char.
if you can not change the 0-objects, then probably because of missing auth - which in your case I would recommend.
regards
Cornelia