Negative XP Command Bug
It is impossible to reduce the Level of a Player with the "/xp" Command. However, this was possible in earlier versions of Minecraft PE. (For Example: "/xp -5L @p") This command should take 5 Levels from the Player, for example if he was Level 15, he's now level 10, but the Command only works with positive numbers in the Beta of 1.2.
Created Issue:
Negative XP Command Bug
It is impossible to reduce the Level of a Player with the "/xp" Command.
It is impossible to reduce the Level of a Player with the "/xp" Command.
It is impossible to reduce the Level of a Player with the "/xp" Command. However, this was possible in earlier versions of Minecraft PE. (For Example: "/xp -5L @p") This command should take 5 Levels from the Player, for example if he was Level 15, he's now level 10, but the Command only works with positive numbers in the Beta of 1.2.
Hey,
Yeah I know, that I have to search the bug first before reporting and I searched it but only with the Filter for 1.2 Bugs only since I wasn't expecting that it also happend in earlier Versions because I never experienced that Bug before and it worked for me in the Version before the Beta.
And yeah it's really strange with Command Bugs, they almost never fix them and if they work in the current version, they suddenly don't work in the following version anymore. And they don't get fixed, even if the Bug is easy to find and everyone is aware of it.
Anyways, I hope they'll fix it soon xD

Hello,
I'm not a moderator so everything I say is not necessarily correctand is not an order but this bug has already been reported several times on these versions. Please check if a bug has not already been reported before you report it yourself (even if you were on the mobile site, despite the fact that it is not well organized)
Thanks you
PS :
From memory, this bug has only been fixed on a version since the addition of the XP command and then reappeared on the following versions. The moderators do not seem to be dealing with this problem because the reports from the addition of the command have still not been classified as "confirmed". If you want more reactivity, try to contact a developer (on social networks for example)
Yeah, my friend tried to use the /xp -4L @p[r=10,lm=4] in 1.2 Build 7 (1.2.0.22), but it said that "@p" was supposed to "be not there"...so he tried using "/xp -4L @a" without the selector arguments and still didn't work.
Then, because I have iOS, I tried doing exactly the same in 1.1.5 and worked perfectly. It gave 4 levels of XP and then it removed them when I was 10 blocks around the command block and when I had had 4 levels of XP. It worked correctly.
Fixed in 1.2.0.25.