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, 5 July 2007
RE: This.
Okay, I see (as the above answer points out) that the example and the card are worded the same.
However, I still contend that it's an important distinction that the example is of an action and the Tetsubo has a trait.
An action is taken and resolves, creating a one-time effect. If the Tetsubo's trait is a one-time effect, when does it occur? There is no reactive timing before a colon (i.e. Blade of Guile "After this card attaches: Rehonor this Personality."). So why was it ruled that the Tetsubo's trait not ongoing?
I apologize if I sound combative. I'm merely trying to understand the logic behind this ruling. As always, thank you for reading.
Martin Lund (rules official), 5 July 2007
If a negation effect is continuous (such as, “This card can not gain Force bonuses” on a card in play), it negates all relevant instantaneous, ongoing and continuous effects while the negation effect applies. If such an effect ceases to apply, ongoing effects do not reassert themselves, but continuous effects do.
Non-continuous negation effects (that is, from actions and triggered traits) vary in scope and duration, depending on how they are written.
This is a continuous negation effect, and thus negates all relevant instantaneous, ongoing and continuous effects while the trait remains on a card in play.
If it were the result of a triggered trait or an action, then you'd go down the bulleted list and arrive at the bottom entry (Otherwise, (such as a Battle action just saying “Negate all Force penalties on your Samurai”) such a negation should be interpreted as an instantaneous negation that only ends existing ongoing effects, with no effect on continuous effects or new ongoing effects.) - but in this case that does not apply.
Several people read through the Comp. Rules and had the same confusion (myself included) before Chris highlighted the key point. Like I said, we'll look into better formating to make the answer to this sort of question a little more accessible.