What must be done to ensure that you can use a custom generic (MDF) object...

To enable a custom Generic (MDF) object for Employee Self-Service (ESS) in SAP SuccessFactors Employee Central, the following configurations are necessary:

C. Create one configuration UI for the object.

A Configuration UI (User Interface) must be created for the MDF object to define how users will interact with it. This UI facilitates data entry and management within the ESS framework.

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D. Set the externalCode field to Data Type = User.

TheexternalCodefield should be set to the 'User' data type. This configuration ensures that the object is associated with specific user records, enabling personalized data management within ESS.

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Options A and B are not required for enabling a custom MDF object for Employee Self-Service:

A. Set the externalName field to Data Type = User.

TheexternalNamefield typically holds descriptive information and does not need to be set to the 'User' data type for ESS functionality.

B. Create a Valid When association for the object.

While associations can define relationships between objects, a 'Valid When' association is not a prerequisite for enabling ESS capabilities for a custom MDF object.