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  WARHAMMER 40,000 – WHITE DWARF: DEATHWATCH
  WHITE DWARF: DEATHWATCH
  Indomitus Version 1.0
  These documents collect amendments to the rules and present 
  our responses to players’ frequently asked questions. Often 
  these amendments are updates necessitated by new releases or 
  community feedback; these can be identified by the presence 
  of an asterisk before the page reference. At other times, these 
  amendments are errata designed to correct mistakes or add 
  clarity to a rule that is not as clear as it might be. 
  As they’re revised regularly, each of these documents has a 
  version number; where a version number has a letter, e.g. 1.1a, 
  this means it has had a local amendment, only in that language, 
  to clarify a translation issue or other minor correction. When 
  a document is revised, the version number will be incremented 
  and new updates will be highlighted in blue, while new errata 
  and FAQs will be highlighted in magenta.
  UPDATES & ERRATA
  *Page 72 – Combat Doctrines
   Replace the Combat Doctrines ability with the following (note 
  that the Devastator Doctrine, Tactical Doctrine and Assault 
  Doctrine remain unchanged):
   ‘If your army is Battle-forged and if every unit from your army 
  has this ability (excluding Servitor and Unaligned units), this 
  unit gains a bonus (see below) depending on which combat 
  doctrine is active for your army, as follows: 
  •  During the first battle round, the Devastator Doctrine is 
  active for your army.
  •  During the second battle round, the Tactical Doctrine is 
  active for your army.
  •  At the start of the third battle round, select either the Tactical 
  Doctrine or Assault Doctrine: until the end of that battle 
  round, the doctrine you selected is active for your army.
  •  During the fourth and subsequent battle rounds, the Assault 
  Doctrine is active for your army.
   With the exception of Special Issue Ammunition (see Codex: 
  Deathwatch), and unless specified otherwise, this bonus is not 
  cumulative with any other rules that improve the Armour 
  Penetration characteristic of a weapon.’
  Page 73 – Stratagems, Duty Eternal
  Change this Stratagem to read:
   ‘Use this Stratagem when a Deathwatch Dreadnought model from 
  your army is chosen as the target for an attack. Until the end of 
  the phase, when resolving an attack made against that model, you 
  can reduce any damage suffered by 1, to a minimum of 1 (this is 
  not cumulative with any other rules that reduce the damage).’
  *Page 56 – Stratagems, Adaptive Strategy
  Delete this Stratagem.
  FAQs
  Q: Can the Combat Doctrines ability improve the Armour 
  Penetration characteristic of kraken and vengeance rounds past 
  the maximum listed in their abilities?
  A: No.
  
SOURCE: textdata/thevault/Warhammer/40k/9th Edition - Warhammer 40K/Errata & FAQs/40K_9th_ed_Update_White_Dwarf_Deathwatch_Ver_1.0.pdf