Permission to Edit Sales Team Contribution % on Sales Orders

Roles can be configured to allow users to edit the Sales Team Contribution % on Sales Orders.

Solution
To add the permission:

1. (Administrator) Navigate to Setup > Users/Roles > Manage Roles.
2. Click Edit on the custom role that needs permission.
3. Under the Permission tab > Setup subtab > Add Team Selling Contribution | Access Level = Full
4. Click Save.