1.ISD registeration is compulsory or optional?
2. For showing input in GSTR 6A of distribute r(head office) supplier which GSTN of receipent (Head office ) show in GSTR 1? normal GSTN of head office or ISD GSTN of head office?
3.if head office input is claimed in their GSTR1 not distributed to branches in GSTR 6 if any problem? It is required to reverse under "other Reversal" coloumn?