# zero: do nothing, no sepa_export_item exists, no match
# more than one: does this ever apply? Currently you can't create sepa
# exports for invoices that already have a non-executed sepa_export
# zero: do nothing, no sepa_export_item exists, no match
# more than one: does this ever apply? Currently you can't create sepa
# exports for invoices that already have a non-executed sepa_export