Official rule text
[ibr-cl-23]-Unit code (ibt-130), (ibt-150) MUST be coded according to the UN/ECE Recommendation 20 with Rec 21 extension
What this means
The unit-of-measure code for a quantity is not one of the allowed UN/ECE Recommendation 20/21 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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TechMate is a systems integrator, not an OTA-accredited Service Provider. We help you get ready and connect you to an accredited provider; final validation and acceptance always sit with that provider and the Tax Authority.
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