Official rule text
[IBR-080-OM] - When Item classification identifier (IBT-158) is provided with @listID='HS', it must be exactly 12 digits (Oman HS code). 6-digit ISIC codes are validated separately under CL-08-OM-ISIC and 8-digit service-type codes under CL-12-OM.
What this means
The HS (customs) classification code is not exactly 12 digits — Oman HS codes must be 12 digits long.
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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