[Lord Magus]

I am running into trouble with a particular item I am coding

It is a special armor that is easily enchanted with specific armor item powers, reducing the cost of such powers by half.

I have tried the following 2 scripts at First - 2550, but I get the error message:
Syntax error in 'eval' script for Thing 'mAMSAWvScl' (Eval Script '#1') on line 1
-> Script reference is invalid under the circumstances

  perform findchild[BaseItemPw,thingid.ipAMSAArFo?].setfocus
  focus.field[iPriceCash].value *= 0.5

  perform container.gizmo.setfocus
  if (focus.tagis[thingid.ipAMSAArFo?] <> 0) then
    focus.field[iPriceCash].value *= 0.5
  endif

I then tried this

  foreach pick in gizmo from BaseItemPw where "thingid.ipAMSAArFo?"
    eachpick.field[iPriceCash].value *= 0.5
  nexteach

which at least compiled but did not reduce the price and gave me this message
Attempt to access non-existent containing entity from script
- - -
Can't foreach over invalid container (this is probably related to a previous error)
- - -
Can't foreach over invalid container (this is probably related to a previous error)

Finally, it dawned on me that the armor type and the item powers are both gizmos on a magic armor pick, so I tried

  perform container.parent.setfocus
  perform focus.findchild[BaseItemPw,thingid.ipAMSAArFo?].setfocus
  focus.field[iPriceCash].value *= 0.5

and got the same error as the first 2 tries.

Is it possible to steer me in the right direction or at least to point me to an item that does a similar thing? I feel like I'm getting lost in transitions here. Thanks!