/ubl:Invoice/cac:InvoiceLine/cac:DocumentReference/cbc:ID/@schemeID

Invoice Line Document Reference Scheme ID

Australia | VRBL-Invoice-AU-1p0
Context ID INV1217
Usage O
Format UNCL1153
Mandate Business Term Code IBT-128-1
Final Format Path /ubl:Invoice/cac:InvoiceLine/cac:DocumentReference[cbc:DocumentTypeCode != "130"]/cbc:ID/@schemeID

Description

If it may be not clear for the receiver what scheme is used for the identifier.