27. In Sec 127 the focus is on whether the penalty specified in Sec 122, 125 etc are being imposed during an already open proceedings or not. If the penalty is planned to be imposed under Sec 122 or even 125 in any proceedings that are not open as mentioned in Sec 127, then, the way to go is by invoking Sec 127. In my opinion Sec 127 needs to be compulsorily invoked whenever proceedings are not initiated or open with regard to assessment (Sections: 62, 63, 64) or adjudication (Sec 73,74) detention and seizure (Sec 129) or Confiscation (Sec 130). This is a machinery provision for imposing penalties in circumstances that are not part of already open proceedings. For example, if a registered dealer has not displayed his GSTIN number as mandated the Officer may impose a penalty independently by invoking Sec 127. This being a machinery provision, the quantum of penalty shall be as per Sec 122 or 125 or any other applicable provision.
All the mentioned provisions in 127 (62, 63, 64,73,74,129,130) have their own specific code of due process laid down. If the officer wants to impose some other penalty outside these already open proceedings he has to invoke Section 129 which has inbuilt provisions for principles of natural justice.