Official rule text
[ibr-cl-21]-Item standard identifier scheme identifier (ibt-157) MUST belong to the ISO 6523 ICD list.
What this means
The coding scheme stated for an item's standard identifier is not one of the allowed ISO 6523 ICD 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 — freeInvoice identifiers & type
Whether the invoice's own core facts — its number, issue date, currency, UUID, and Oman-specific transaction-type marker — are present, correctly formatted, and internally consistent.
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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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