Official rule text
[ibr-cl-07]-Object identifier identification scheme (ibt-018-1) (ibt-128-1) MUST be coded using a restriction of UNTDID 1153.
What this means
The coding scheme used to identify a referenced object on the invoice is not one of the allowed UNTDID 1153 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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