Is it possible? I just tried on a 2nd SPR but found it only allows me to put the SP on another 2nd job skill, I kinda regret that... I'm a crossbowman so I got quite some spare SP from Final Attack. That's actually just some accuracy for a DEX job but it's making me really scratching my face wasting SP on a skill that I'll never use.
Found my solution at https://forum.maplelegends.com/index.php?threads/sp-resets-between-jobs.27784/ You need to have a extra SP to make it work. Here are the steps: 1. Add your extra SP into the lower job skill 2. Use SP Reset of your current job level to extract a SP from the skill where you originally want to subtract (Final Attack in my case) 3. Put the extracted SP into where it was supposed to be (3rd, 4th jobs whatever) So yeah... Basically the same rule as HP wash.
