As you note, the Applied Analytics Using Enterprise Miner notes (page 9-28) suggest using the Transform Variables node to change the name, but may be simpler to just perform a DATA step in the SAS Code node. Assuming you are inputting and outputing a training data set, the DATA step might look something like the following:
data &EM_EXPORT_TRAIN;
set &EM_IMPORT_DATA (rename=(_NODE_=<newname>));
run;
Hope this helps.
Dave
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