How to import AR transactions for multiple BUs in the same FBDI

We have a requirement to import AR transactions for multiple BU's via a single FBDI template. The Import AutoInvoice process restricts the BU selection to 1 only.

We are trying to use the "Import Receivables Transactions using AutoInvoice" process instead, since it has BU as an optional parameter. However, when running the predecessor job "Load Interface File for Import", there is no option to select this particular import job. Instead, we can only select the "Import AutoInvoice".

Please let me know if there is a possibility to import transactions over multiple BU, in a single FBDI file, through a single import job.