NFE-627
Rejeição: O valor do ICMS desonerado deve ser informado [nItem: …] (motDesICMS …).
In English A reason for ICMS relief (motDesICMS) needs a vICMSDeson above zero.
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
not($icms/nfe:motDesICMS) or br:dec($icms/nfe:vICMSDeson) gt 0
Checked with NF-e 4.00, NF-e 4.00 with authorisation protocol