I took modified script from scifi "automatic door". This activates "destruction" animation and inits decal when player reaches 300 points distance to the wall object.
Wall script (scriptbank/user/breakwall.fpi)
:state=0,plrdistwithin=300:state=1,setframe=0,sound=$0,rundecal=1
:state=1:incframe=0
:state=1,frameatend=0:state=2,coloff
:state=2:state=3
:state=3:state=3
Really, I'm not sure you need to set up wall because all settings are included in fpe file coming with it. if you can post the screen of entity settings here i'll try to find out whatsup
If you want it to be trigger or zone activated, you need some DIY scripting as i'm not so good with those uh... triggerS
Parallels can cross. Evidentially.