NFE-883
Rejeição: GTIN (cEAN) sem informação [nItem: …] (use "SEM GTIN").
In English cEAN is empty; a product without a GTIN takes "SEM GTIN" (MEI issuers, CRT 4, excepted).
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.
nfe:infNFe/nfe:det
$ean != '' or $crt = '4'
Checked with NF-e 4.00, NF-e 4.00 with authorisation protocol