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deatchwatch is a supplement for the spacemarine codex, but in deathwachts it says you battleforged if every unit has the deathwatch keyword
so if im understanding correct i can use spacemarine unit from codex spacemarine in the same detacment without breaking the detachment rules
but do the units from the spacemarine codex use the same rules as deathwatchs units from the supplement, gaining special ammunition.
and how about doctrines deathwatch doesnt follow the normal rules but can choose a couple of times in wicht doctrine thy are,
does this also mean the units from the sm codex are in that doctrine or do these follow the normal rules from codex sm?

Deathwatch can take units from the Space Marine codex as Deathwatch. Such units gain the Deathwatch keyword and are Deathwatch.

They gain all rules that apply to units with the Deathwatch keyword. Doctrines apply to them as they do any other Deathwatch unit.

Note that in the new supplement there is much more restriction on what units get Special Issue Ammo than in the previous codex.

what i can see is that only units from the supplement get the special ammo

Its not just units from the supplement, its very specific weapons. SIA is extremely limited, "special" I guess you could say.
Deathwatch is now a keyword like "Ultranarines" etc, you replace the <Faction> with the appropriate keyword.

 skeleton wrote:
what i can see is that only units from the supplement get the special ammo

Specifically, only weapons with the Special Issue Ammunition ability. Primaris Bolt Rifles for instance do not have SIA, even for units in the Deathwatch Supplement.

 skeleton wrote:
deatchwatch is a supplement for the spacemarine codex, but in deathwachts it says you battleforged if every unit has the deathwatch keyword
so if im understanding correct i can use spacemarine unit from codex spacemarine in the same detacment without breaking the detachment rules
but do the units from the spacemarine codex use the same rules as deathwatchs units from the supplement, gaining special ammunition.
and how about doctrines deathwatch doesnt follow the normal rules but can choose a couple of times in wicht doctrine thy are,
does this also mean the units from the sm codex are in that doctrine or do these follow the normal rules from codex sm?

As noted by others Deathwatch now counts as a <<Chapter>> of Space Marines. You get a detachment or army of Deathwatch the same way you get a detachment or army of Ultramarines. Codex Space Marines notes which units from that book may have Deathwatch as their chapter.

Special Issue Ammunition is now a rule for specific weapons, generally called Deathwatch weapon of some sort or another.

All units in a Deathwatch army are affected by Mission Tactics, the Deathwatch Doctrine rule.