Modvatable invoice requirements: indenting dealers need not register but must be named; original invoice credit requires verification. Indenting dealers need not be registered but must be named on invoices under Rule 57GG; credit on original invoices where duplicates are lost is permitted for supplies under Rule 52A and Rule 57GG only after Assistant Commissioner scrutiny and verification from the originating range; and the phrase 'if he is not the supplier' is deleted so manufacturer/importer particulars must be given in all cases.