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A friend of mine and I are playing a game with some destructible walls and some indestructible walls. He wants to know if he can target his blast weapon (missile launchers, defiler big cannon) at indestructible walls if we can technically target them at the destructible walls. I didn't know if there was a rule for or against being able to target blast weapons at... nothing, basically, in the hopes that the scatter carries them where you want them to, or if they have to be targeted at a defined, attackable unit/target (walls, sentry gun, etc)

Thoughts?

Well this is all house rule stuff, the easiest way to determine what can and can't be fired at is to give it an armor value.

AKA this wall is AV 10

You always have to have a target for blast weapons to fire at an object. A model has to exist that has a toughness value or armor value. In general what is being fired at must have some kind of game profile.

In general, no. Unless it's an indirect fire weapon, you have to declare a unit as your target. So no shooting at the woods they're behind and hoping it scatters past.

Indirect fire weapons still have to declare a unti as a target, all they gain is that it can be out of line of sight.

Short answer: no.

Long answer:

BRB pg 30, Blast section wrote:...pick one enemy model visible to the firer and place the blast marker (see diagram) with its hole over the base of the target model, or its hull if it is a vehicle.

So, if you have declared some walls 'destructible' then you have effectively allowed them to be treated as models for the purposes of gameplay. For those walls that are not destructible, they are terrain, not models and so cannot be the target of a blast weapon.

Second the option of giving them an armour value, effectively putting immobile vehicles on the board. That really would solve all your problems and keep you within the rules.