Help Skill condition

[0flee]

I can make skill replace with another in fishing npc skill learn? If a player have skill for exemple, id 1000 and i add a custom one 1001, i want when player buy 1001, to exchange for 1000. I search , but i haven't a documentation about skill "set".

In fishingSkillTree i put this for 1001 preRequisiteSkill id="1000" lvl="1" /> but player still can have both skills. id 1000 and 1001
Greetings

Edited June 16, 2020 by 0flee