I will make a note of it on the review sheet, but I have never made an issue of it. As long as the qualifying income can be supported, I have let it go. I have reviewed files where one spouse's income was dropped from DU because the other made enough to support the loan, even though both incomes were documented in the file.
Now, if documented income is LESS than what was used to qualify, then I would make an exception.
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There's never enough time to do all the nothing you want.