@beelee
Again, I reference PoS2;
isAAforBombingThisUnitOnly values: allows this unit to be an AA gun only when this unit is directly attacked by a strategic bombing raid (currently defends against all strategic bombing attacks in this territory, not just against this unit). it will not defend against a normal attack.
There are 2 units in Germany with "isAAforBombingThisUnitOnly" so both units defend against SBR attacks against that territory, PoS2 clearly states not just against this unit.
And again the PoS2:
typeAA. values: any string which identifies this type-group of aa guns. Only 1 aa gun per group may fire (unless you've set maxAAattacks). (defaults to "AA") Warning: all units with the same typeAA must have the same dice sides, or else you will experience weird results.
So, if both units have the same "typeAA" as "AA", the default if missing, then they fire as a group, with only the best unit defending.
SBR units attack a territory, only the damage is applied to a selected target. This is how aaGuns work in 'classic' style maps. They can defend against SBR, even though they are not targeted.
Cheers...