Many clients in the US require 1099 amounts for the calendar year but there appears to be no way to migrate mid-year 1099 amounts, by vendor, without migrating historical transactions. Because my client has many 1099 vendors, this will be a significant issue and we may need to consider holding off cut-over until the new year.

I suggest the ability to enter a balance forward/beginning 1099 amount or, perhaps better, the ability to enter an adjustment to the cumulative 1099 amount, by vendor - not associated to Business Central transactions.