Hello,
Please try including in the reference number column of your import data, new numbers that are higher than the highest existing inventory adjustment batch that is already in the system.
For example, if 009999 is the last number already used for inventory adjustment in your tenant, then the spreadsheet can be anything higher, such as 010000 or 020000. No matter what you use as the next number in your spreadsheet, Acumatica will look to the Numbering sequence, add +1 and that will be the first imported inventory adjustment’s batch number. Acumatica will correctly, sequentially, count up from there.