ERR229
General TIN (030) is only allowed for foreign supplier: the buyer's TIN is EI00000000030.
error: the document is invalid
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
$supplier or $tin ne 'EI00000000030'
Checked with MyInvois e-Invoice