NFE-771
Rejeição: Informado idEstrangeiro em operação interestadual [nItem: …].
In English idEstrangeiro in an interstate operation is only allowed with CFOP 6667.
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($idDest = '2' and ../nfe:dest/nfe:idEstrangeiro) or $cfop = '6667'
Checked with NF-e 4.00, NF-e 4.00 with authorisation protocol