Role for Requisition requestor to do Scoring and Send Messages

Summary:

We have an ask from business that in the RFQ , the end user (Requestor of the Purchase Requisition) has to be added as a scoring team, and he/she should be doing the technical scoring evaluation.

We can add requestor as part of Scoring team, and Enable the Scoring only option and Send and Recieve the messages ,and We created a custom role by coping " Sourcing Project Collaborator role, and customize to have  following privileges:

Negotiation Viewing Duty (Role)

Negotiation Response Evaluation Duty (Role)

View Supplier Negotiation Work Area (privilege)

But the issue is that the End user is not able to view the Messages once the Message page is open the redwood message page comes with Nothing , I tried to add the following Priviages also but it end with same result