The shooting rules state basically that you decide what to fire when you have more than one weapon type.
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Then roll a D6 for each shot being directed at the target formation
Ignoring speed rolling practices, this means each hit is well defined, i.e. I'm the hit inflicted by the roll representing the second shot of unit 3 in this Devastator Detachment and could hit unit 1, 3 and 5 of the target formation.
Than you allocate hits
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You must allocate hits inflicted on your formation against targets that are within range and line of fire of the enemy.
Sadly "enemy" isn't further specified.
So it is open to a bit of interpretation. I'd say it should be "the enemy which inflicted this hit". Most people agree that it is not any enemy, but at least an enemy which took part in the rolling of that batch of dices to which the hit belongs, but "the enemy which inflicted this hit" makes the most sense.
The hit must be allocated to an unit, which the shooter could see and reach. So a direct hit can never be allocated to an "indirect" target or a target out of range. And when you roll your dice individually, than you know whether the hit was direct or indirect or whatever. By the way you also know this when speed rolling, because you roll ordinary and barrage shots separately.
Hits by barrages are always allocated to units under the template, regardless of the number of hits already allocated to them. Ignoring speed rolling, each unit would have to be rolled for, so it's definitely known which unit under a template is hit.
Still there are some potential problems deriving from the order in which hits are allocated.
To solve them the easiest way is to say that the hits have to be allocated in a way so that the biggest number of units will be hit (This is done in accordance to the FAQ ruling about allocating AP and AT hits on LVs mixed with AV or INF targets).
This leads to: Allocate barrages first, and than allocate ordinary hits in reverse order of the number of potential targets of each hit. I.e. First the barrages, than the hits that could only harm the first three units and than the rest of hits which could harm all units.
Speed rolling. All units that can hit the same targets and have the same to hit value and weapon type can be rolled together and allocated in one go.
Very often you will realize that only a minority of the shots has a limited group of targets and that you will always be able to allocate the hits of the minority. In such a case it makes no difference when you roll these dice together with the majority's dices.
Regards
Stephan