Ide Tadaji vs. Hantei Genji and Hantei the 38th (L5R rules board)

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, 24 June 2007

Hantei Genji and Hantei the 38th both have additional costs that can involve discarding the favor.

You must discard the Imperial Favor or bow Personalities and Followers you control with more than 12 total Force as an additional cost of playing Hantei Genji.

You must discard the Imperial Favor or bow personalities and Followers with a combined Force greater than 15 to put this card into play.

Can Ide Tadaji use his reaction:

Political Reaction: Bow when the Imperial Favor is used. The Favor's effect is negated, but the Favor is still discarded. (Clarification: Only negates the effects of one use of the Favor, not all uses for the rest of the turn.)

To negate the paying of that cost (and thus preventing them from entering play if they can't discard it again or don't have the force)? Or does Ide Tadaji's ability only apply to Actions that use discarding the Imperial Favor as a cost?

[Mod edit: Thread title. -ZF]

Zen Faulkes (rules official), 24 June 2007

Hantei Genji and Hantei the 38th both have additional costs that can involve discarding the favor. Can Ide Tadaji use his reaction to negate the paying of that cost?

Yes.

On: Ide Tadaji, Ide Tadaji, Hantei Genji, Hantei the 38th