The Loader Record Details tab displays a short preview of the records available in your feeder file. The preview table displays a maximum of 5 records. The preview table is to help users identify if they are uploading the correct file. Also, this tab allows you to identify the kind of action you want to perform on the managed objects specified in your feeder file. You must complete the following fields:
Identifies the fields from the feeder file that mention the kind action you want to perform on the managed objects. For example, you can use a feeder file with a field 'action' that takes the values Create, Modify, and Delete. You must map each of these actions to an Admin Task in Loader Action Mappings.
Identifies the field from the feeder file that can uniquely identify the Primary Object.
Note: If the feeder file has an invalid header, the feeder file records will not be displayed in the Loader Record Details tab. If the header is missing in the feeder file. You must select another feeder file in case of invalid headers. If the feeder file contains some invalid records, the detailed status of the uploading will be in the View Submitted Tasks tab.