Difficulty with field pChosen2

[Lord Magus]

I have created an adjustment that grants a +1 inherent bonus to 2 different ability scores. I have set Menus #1 and #2 to Attributes.

Pre-Attributes / 10000
~ If we're not enabled, get out now
  doneif (field[pIsOn].value = 0)

~ If ability score(s) not chosen, get out now
  doneif (field[pChosen].ischosen = 0)
  doneif (field[pChosen2].ischosen = 0)

~ Add to our chosen attribute(s)
  field[pChosen].chosen.field[aNormMod].value += 1
  field[pChosen2].chosen.field[aNormMod].value += 1

And I get the following error message:
Attempt to assign field value with no pick context
Location: 'eval' script for Thing 'pSOULGftUwGds' (Eval Script '#2') near line 10

which corresponds to the attribute chosen in pChosen2. I have not been able to circumvent that, and actually need to use this adjustment as a part of a complex ability. Any pointers as to what is going on? Thanks!