If you considered it to be an application without income, then you obviously didn't rely on any income in processing the application at the time the application was withdrawn or the file closed for incompleteness. Per 1003.4(a)(10)(iii) and comment 4(a)(10)(iii)-5 and the FIG, I think you would report NA for that field.
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions