Final Answer:
In the 'function authorizations for buyers' user parameter (EFB) in SAP Materials Management, the indicator that can be set for the manual source assignment is the "Source Determination" indicator.
Step-by-step explanation:
Function Authorizations for Buyers (EFB): This refers to the user parameter in SAP Materials Management that controls various functions and authorizations for buyers.
Manual Source Assignment: In the context of SAP MM, manual source assignment involves the ability for users to manually specify the source or supplier for a particular procurement requirement.
Indicator in EFB: Within the 'function authorizations for buyers' user parameter (EFB), an indicator can be set to enable or disable specific functions. In this case, the "Source Determination" indicator is relevant to manual source assignment.
Source Determination Indicator: This indicator allows users to manually determine the source of procurement for materials, giving them control over the assignment process.
Explanation for Setting the Indicator: By setting the "Source Determination" indicator in EFB, users gain the ability to manually assign sources during the procurement process, providing flexibility in supplier selection.
Relevance to User Parameter: The setting in EFB directly influences the user's authorization and access to manual source assignment functionality.
Not True for Other Options: Without detailing options that are not true, it's important to focus on the correct indicator for manual source assignment.