Invoice Management Under VeriFactu: What invoices are imported from some other (non-SIF) program?

Under the VeriFactu framework, invoices imported from external (non-SIF) sources must be managed separately from those generated within a certified SIF system, with compliance responsibility falling on the original issuer. These imported invoices are not subject to QR code regeneration or AEAT resubmission, as their compliance is tied to the originating SIF.