Official rule text
[ibr-cl-11]-Any registration identifier identification scheme (ibt-030-1), (ibt-047-1), (ibt-061-1) MUST be coded using one of the ISO 6523 ICD list.
What this means
The coding scheme used for a legal registration number (seller, buyer, or another party) is not one of the allowed ISO 6523 codes.
What to do
Share this rule id with whoever manages your invoicing software or IT — or ask TechMate to fix it for you (see below).
Check whether your invoice hits this rule — freeCodes & classifications
Whether codes on the invoice — item classification (HS, ISIC), Incoterms, unit codes, document type — are drawn from the exact code list Oman's rules require, not just any plausible value.
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