Tried this:
Code:
/castsequence [@player] Dispel Magic,0,0,0,0 
/castsequence [@party1] 0,Dispel Magic,0,0,0 
/castsequence [@party2] 0,0,Dispel Magic,0,0
/castsequence [@party3] 0,0,0,Dispel Magic,0 
/castsequence [@party4] 0,0,0,0,Dispel Magic
And it works perfectly :-)