As far as we've always played it and known it, AND read it on the forums, Bone Lacing in SR4 does not add to the Body attribute directly. It's just damage resistance. A human can have Body 6, a Suprathyroid(7), and Titanium Bone Lacing, and roll 10 dice to resist damage.
Perhaps a dev can shed light on this, but as far as I know, Bone Lacing does not add directly to Body.
Another reason that leads to this is how it's recorded on character sheets. Someone with Muscle Toner or Reaction Enhancers, for example, is recorded as Agility 4(6) or Reaction 5(6) and whatnot. Someone with Bone Lacing is usually recorded as Body: 5(+2 damage.) It's like the Dwarf's Body Bonus for diseases. Dwarves get +1 Body, yes, but that +2 dice to Body tests(which it's listed as) to resist diseases and toxins does NOT help them resist damage-just like Bone Lacing does not add health boxes or help with poisons or diseases. A Dwarf's augmented max Body is still 10.
I don't even see any example characters/contacts with Bone Lacing where it's listed as Body 3(5) or whatnot. Yes, there are some mistakes in the books but I don't think that every one of these was mistook. I always knew:
Suprathyroid: Increases stats directly.
Toner/Augmentation/Replacement: Same
Reaction Enhancers/Reaction bonuses from Wires/Boosters: Same.
Synthacardium: Does not add directly to the skill. Not subject to cap.
Combat Sense: Same.
Adept Power Improved Ability: Subject to caps. Adds to skill. Same for Reflex Recorder.
Kinesics: Not subject to cap, adds dice.
Smartlink: Adds dice.
Bone Lacing: Adds dice for damage resistance ONLY. Not extra boxes, not lifting, not Athletics, nothing but damage. Has never, to my knowledge, been subject to cap, and even if it was, it would be houseruled out unless it gave other bonuses like the rest. (then again, we houserules out augmented caps anyway, subject to a few other little adjustments, like greater cost to go above said caps.)
Pathogenic Defense/Toxin Extractor: Only adds dice to resistance tests, like Dwarves. Confers no other Body bonus, not subject to caps.
Again, if Bone Lacing said: ''Gives +X to Body. (Period.)'', then I would say it's subject to the cap. Otherwise, no.
EDIT: Quoting the RAW like this, though:
QUOTE
[...]bonelacing confers a bonus of +1 to the Body attribute[...]
You cut out the important:
QUOTE
...for damage resistance tests.
Where with Reaction:
QUOTE
[...]wired reflexes confer a bonus of +1 to Reaction[...]
it says:
QUOTE
...and +1 Initiative pass per point of rating.
There is no ''For Dodge tests only'' ''For Initiative tests only'' or anything, thus, it's a bonus to Reaction.
However, I would say, that if it is how it looks(Ie, just a bonus for damage resistance), the wording SHOULD be ''adds X dice for damage resistance.'' If it gives a pure Body bonus, it should say ''Adds X to Body.''