<OperationOutcome xmlns="http://hl7.org/fhir">
  <issue>
    <severity value="error" />
    <code value="invalid" />
    <details>
      <coding>
        <code value="FORMAT_ERROR" />
        <display value="Format error" />
      </coding>
      <text value="Invalid organisation number format. Please use format NNNNNNNNNN or NNNNNN-NNNN. For sole proprietorship use format YYYYMMDDNNNC or YYYYMMDD-NNNC" />
    </details>
    <expression value="performer.actor.identifier" />
  </issue>
  <issue>
    <severity value="error" />
    <code value="invalid" />
    <details>
      <coding>
        <code value="VACCINE_PRODUCT_NOT_FOUND" />
        <display value="Vaccine product not found" />
      </coding>
      <text value="Vaccine product with nplId 12345 is not valid" />
    </details>
    <expression value="vaccineCode.coding[0].code" />
  </issue>
</OperationOutcome>