PEPPOL-T76-R010
An order response with code AB (Acknowledged) must NOT provide order lines.
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
cbc:OrderResponseCode
Test
(normalize-space(.) = 'AB' and count(../cac:OrderLine) = 0) or normalize-space(.) != 'AB'
Checked with Peppol Order Response