For user-defined fields to be passed from an Aggregation SAM to a Presentation layer SAM, configure the dxa configuration file & restart the Aggregate SAM.
The following shows an example from a dxa-sam.conf configuration file which is configured to pass the fields UserDefined1 and UserDefined2 from the Aggregation SAM to a Presentation layer SAM:
# Subscribe to a Notification List
# NLName/n
#sub ALL_NOTIFICATIONS/n
sub Default/n
notification
attr UserDefined1
attr UserDefined2