First problem
Indirect fire rules on p. 30 BMM and p. 111 TW say, that if a spotter attacks during the same turn it spots, the spotter, suffers +1 to attack rolls during the following Weapon Attack Phase, as do any indirect fire attacks against a unit spotted in this way. Since after recent rules changes successfully TAGing a unit also counts as spotting it:
1. does anyone who successfully uses a TAG suffer +1 to all attacks during the following Weapon Attack Phase?
2. does anyone firing indirectly at a unit "spotted by TAG" suffer +1 to such attacks?
Under the current TW errata the answer seems to be "no" to both (see the TW errata for TAG (Target Acquisition Gear) (p. 142)), but no such rule seems to appear in BMM (I've checked both the indirect rules on p. 30-31 BMM and the TAG rules on pp. 113-114 BMM).
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Second problem
The rules in TW (both on p. 111 and pp. 142-143) don't say, that in case you fail your to-hit roll to TAG a target, you can still spot one target without using a TAG. It is clear in the BMM (under TAG on p. 31), where it says that not only you can spot in a normal fashion after a failed TAG attempt, but also that you don't have to spot the unit you attempted to TAG.
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Which manual is correct here? I would guess, that it would be TW for the first problem, and BMM for the second, as they provide more detailed rules in those cases, but I want to make sure before posting any errata.