Questão jurídica principal
Whether the assessment decision was void because it misstated the transaction, date, and parties.
Decisão extraída
The defects were serious but did not amount to absolute nullity; the decision was merely challengeable.
Fundamentação extraída
Invalid administrative acts are usually only voidable. Nullity requires a particularly serious, obvious defect that does not seriously endanger legal certainty. The cumulative errors were unusual but not exceptional enough to justify nullity.