Based on the language which Question 19 reiterates from previous guidance:
...use of a NAICS code is not mandatory, and a financial institution may still provide a text response with respect to this information within the “Occupation” field. .
I would be comfortable using a text description in the "Occupation" field even if I had assigned the 2007 codes at the customer level.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.