Final answer:
In SAP Materials Management, the 'Function authorizations for buyers' user parameter (EFB) can be set with the indicator for the manual source assignment, which is the Source List.
Step-by-step explanation:
Within SAP Materials Management, when setting the Function authorizations for buyers user parameter (EFB), the indicator that can be set for the manual source assignment is the Source List. A source list serves as a key component in determining where purchase orders can be sourced and streamlines the procurement process by pre-selecting preferred suppliers.
It plays a significant role in ensuring that purchases are made from authorized and reliable sources, enhancing procurement efficiency and compliance. In the 'Function Authorizations for Buyers' user parameter (EFB) in SAP Materials Management, you can set the indicator for the manual source assignment using the Contract.