Datapack in Pixelmon

Hi, i need an help, i'm trying to create a custom crafting in a pixelmon server, i created the datapack, and for testing i made a crafting for the leather with only minecraft items, and it work well. When i try to switch that crafting with some pixelmon items it don't work. How can i make it work? Also i changed the directory instead using data/minecraft/recipes i tryed to use data/pixelmon/recipes. Still not working...