Hi. I've been playing TS4 for quite some time and had a good understanding of the game. Recently I'm trying to make a custom trait mod with Mod Constructor V4, and I want to add a buff such that the sim will get a Focused Moodlet after reading a book. However, after following some instructions online, this buff will be triggered when my sim starts to read a book instead of finishing reading it. I'm suspecting it has something to do with the test conditions but have no clues where it went wrong.

So to put it short, how do I add a buff such that it triggers only after a certain interaction is completed, rather than when that interaction is starting?