Help with upgrades

[Count_Doobula]

hello, I want to be able to have a game similar to the way vampire hunters plays. My question is that if I make a friendly structure allow an upgrade to effect all allied players. An example of this is if someone researched iron forged swords, and everyone playing on the human side would have iron forged swords upgraded. An answer would be appreciated.

 

[Darg]

event:
'player owned unit event'
a unit owned by player <x> finishes research

condition:
'tech-type comparison'
researched tech-type equal to <iron forged swords>

action:
'pick every player'
'player - set current research level'
pick every player in <all allies of (triggering player)> and do set current research level of <iron-forged swords> to <1> for <picked player>