Next doesn't work for EntryNo on VI import to BR_Transaction

The only option I have on the VI import to BR_Transaction EntryNo field is Incr Assign. It tells me Next is invalid for this column name. I'm attaching a pic of my VI import. I'm in Sage 100c 2018 Premium. What's happening is our imports are copying over existing entries when they go to import a second spreadsheet with the same document date. It's starting over with EntryNo at 1 and replacing data in the existing entries. Does anyone have a fix for this? Any calculated or temp fields that I can use to make this work?