XV-MY-21
The supplier's business activity description (the name attribute of cbc:IndustryClassificationCode) is a mandatory field.
warning: reported, still valid
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
Context
/*/cac:AccountingSupplierParty/cac:Party | /*/cac:AccountingCustomerParty/cac:Party
Test
$msic = '' or normalize-space(cbc:IndustryClassificationCode/@name) ne ''
Checked with MyInvois e-Invoice