A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 28 October 2014
Is tactical advantage considered as an action on a dynasty card for the purpose of A New Alliance?
Tactical advantage:
Battle: Discard a card to give this Personality a Force bonus equal to the Focus Value of the discarded card. (This is an ability granted by the rules to each Tactician Personality)
A New Alliance:
Political Open: The abilities on two target Dynasty or Fate cards (in play) cannot be used.
Alex Jones (rules official), 28 October 2014
Is tactical advantage considered as an action on a dynasty card for the purpose of A New Alliance?
Tactical advantage:
A New Alliance:
The Tactical Advantage ability is granted by the rulebook to each Tactician, and is hence "on" the Tactician.
See the Comprehensive Rules, p28-29, Effects and abilities "on" a card.