Section 6(2)(b) of the CGST Act bars parallel Central and State...

Section 6(2)(b) of the CGST Act bars parallel Central and State GST proceedings only where they seek to adjudicate the identical liability or contravention; shared assessee, tax period, input tax credit, or transactional background does not suffice. Allegations of fraudulent credit based on invoices without actual goods supply remain distinct unless that precise infraction was already adjudicated in State proceedings, so the Central proceedings were not barred. Writ review remains available despite a statutory appeal, but disputes over replies, relied-upon material, genuineness, goods receipt, fraud, suppression, and duplicate liability ordinarily require examination of the adjudication record in appeal absent exceptional circumstances. The writ petition was dismissed, with merits left open in appeal.