No, you must not alter the PG column on the Declaration. Explosives do not have a PG rating, so even if you are directed to use a PG II performance packaging, you must not enter PG II on the DGD but leave the PG column blank. The substance has no PG assigned and you are only directed to use a PG II packaging. In the case of PI 856, the substance is graded PG III, but you are directed to use one grade higher PG II performance packaging. It does not mean that the substance is up-graded to PG II. You must leave the PG column as PG III. The PG rating of the substance has not changed. Only one grade higher packaging is to be used.