Bulkloader - Update Existing with Blank Fields

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Hello,

I have made several attempts to use the Bulkloader to update Existing ILT Sessions. My goal is to update a single custom field. I included minimal data in my file because I was under the impression that by selecting "Skip Blank data fields" all I truly needed to include was the item name and the information to be updated.

However, I keep receiving error files telling me that I need to populate the Minimum Seats field. It is more time consuming for me to verify the minimum seats so I don't overwrite with bad data than it is to just update the custom field.