USER EXIT- Structure or View as well?

Hello friends i have a quick question.

I created a User exit by adding the ZZfields in the Structure.When i replicated into BW i couldnt see those 3 zz fields.When i went back to the Generic Datasource and checked in 'Display Field List' i see my fields as hide field and field only boxes checked and greyed out.When i actually save the generic datasource it shows me all the fields i can edit but not the ZZ fields.I fi need to unhide them then where from and/or do they need to be added to my View aswell.

Thanks.