Create Invoice from Spreadsheet ADFI multi line error

Summary:

We receive a "you must enter a valid business unit (AP-810247) " error when trying to enter multiple lines for an invoice, using the Create Invoice from Spreadsheet (this can be found under Payables - Invoices - Task List).

We duplicate the header number (example: 1 is entered on both lines of the muti line invoice). The cells for the 2nd line are greyed out, but no data values are displayed on the 2nd line, example for Supplier, etc the box is greyed, but no data is duplicated or copied from our 1st line of data for header number 1. When we try to submit this info, we receive the business unit error.