Create Change Request.....?

Hi,

I have configured the system to implement Master Data Governance as per the help available online.

I am trying create the change request, it is giving me error "Enter a relevant role for the creation of supplier master data"

And sometimes it is giving the warning message "Entity type Supplier: Reuse active area does not support the query".

What role should I set in the Business partner and what is the meaning of the above warning message ?

-Thanks in advanced.