NFE-531
Rejeição: Total da BC ICMS difere do somatório dos itens (vBC …, itens …).
In English The ICMS base total (ICMSTot/vBC) is not the sum of the items' vBC.
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:total
br:dec($t/nfe:vBC) = br:sum($icms/nfe:vBC)
Checked with NF-e 4.00, NF-e 4.00 with authorisation protocol