To manage access to the supplier management section in module suppliers, this is done via the role and below steps will guide you to the permission.
Click into the Admin Cogs
icon along the top menu bar.Click into Organisation Administration, then into Roles.
Edit the user's role, and click into the Permissions tab.
Click into the sub header Supplier and check/uncheck the permission Manage Suppliers (View Only).
Click the Save Changes button at the bottom to confirm the changes.
This does not stop the supplier from updating it from their login, nor does it have any impact on how the order is sent.
