Grew GRS (Version 1.4) for changing old SUD annotation 'EXTPOS + @fixed' into 'ExtPos + InIdiom=Yes'

gistfile1.txt

package fixed2idiom {
  rule EXTPOS {
    pattern { N[EXTPOS] }
    commands {
      N.ExtPos = N.EXTPOS;
      del_feat N.EXTPOS;
      N.PhraseType = Idiom;
    }
  }

  rule fixed {
    pattern {
      e: X -[deep=fixed]-> Y;
    }
    commands {
      del_feat e.deep;
      Y.InIdiom = Yes;
    }
  }
}

strat main {
  Seq (
    Onf (fixed2idiom)
  )
}

⚠️ the option -config sud is required with the grew command in order to apply the GSD