From: A cold and snowy place far to the north!
It seems there are four salvos in there, if you select the destroyer and press Shift + F1, drag-select all the target, and then go to the 'To Anyone' tab under 'Weapons allocated by selected attacker(s)' you can see them listed with weapon type and quantity.
(pretty neat, yes?)
For the Arty bty, the order is to fire 'ALL' weapons. This could be due to a bug we found and fixed a couple builds ago, and that the salvo was in fact created during gameplay in an older version of the game.
If you remove all salvos, re-load the ship with cruise missiles, and press play, it seems to work fine here on the latest development build at least.
Database guru and scenario designer in the
"Command: Modern Air/Naval Operations