Hi Swati/Sanjay,
No to be honest. As a work around we created a custom role for mass change via PFCG and included the XK99 transaction within it. So whenever the user with the appropriate role opens the NWBC UI they will see the Mass maintenance of Supplier icon beside the Supplier Governance. On clicking it will just redirect to the ECC screens embedded where you execute the xk99 and get access to change all fields/attributes in the MDG level ECC. Once the changes are made in MDG then the same set of suppliers need to selected and replicated to the connecting ECC target systems. It's a 2 step process.
First do the changes in MDG on its own ECC and then replicate to other systems. So far it is working fine. But on a different note I guess SAP has plans to address this in MDG 8.0 or beyond releases. But it is there in their roadmap.
Thanks,
Subhronath