[ibr-071]-A Self-billed invoice should not include an AdditonalDocumentReference (ibg-24) simultaneously referring a self-billed invoice Object Identifier (ibt-018) and an Attachment (ibt-125).
ibr-071/ubl:Invoice | /cn:CreditNotenot(//cac:AdditionalDocumentReference[cbc:DocumentTypeCode = '130']/cac:Attachment)