PEPPOL-T115-B07801
Element 'cbc:RegistrationName' MUST be provided.
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
/ubl:OrderCancellation/cac:SellerSupplierParty/cac:Party/cac:PartyLegalEntity
Test
cbc:RegistrationName
Checked with Peppol Order Cancellation