The Batch # field on the AP Void Payments form.
Enter the number of the original posting batch by which to filter invoices/transactions to void. Press F4 to select from a list of batches within the specified batch month (that is, the AP Void Payments batch month). Only eligible invoices/transactions within the specified batch are added to the Eligible To Void grid.
Leave this field blank if you are not restricting by batch number.