What is the DATA entry in the FND_NODES table.

To resolve a problem, I have cleaned out the fnd_nodes table using "perl $AD_TOP/bin/adgentns.pl appspass=<APPSpwd> contextfile=<CONTEXT> -removesystem"

To then repopulate all the entries in the FND_NODES table, I've run autoconfig on all the tiers, but there is one  'DATA' entry that won't get populated.  I think it might be related in some way to multiple FNDFS entries, but how this helps to get the FND_NODES table properly configured is what I can't work out.

Without this entry, I'm getting the error message "Node id does not exist for the current application server id" when running the adrepctl.sh script, and this error message is also being displayed in the application.