incompatibilities reverse journal

Can I set incompatibilities for reverse journal? To prevent multiple users run reverse journal at the same time

I tried to set now, i dont think it is working. Since i havent seen verify background process yet while testing (running some reverse journal at the same time)

At conflict domain, it is greyed, i can't add any parameter

This question should be asked under GL space / which space?

In EBS module, I know this is under system administrator module

But i do not know sysadmin here belongs to which space?

Thanks.

Vic