Message

Doffin reference MUST match 'YYYY-[][][][][][]' (e.g. 2017-461137).

Context
cac:AdditionalDocumentReference[normalize-space(cbc:DocumentTypeCode) = 'NGOJ']
Test
matches(normalize-space(cbc:ID/text()), '^[0-9]{4}\-[0-9]{6}$')