Spotfire Client: Axis.X or Axis.Y expressions fails in the Cross Table, but works in other visualization types.

A custom expression that refers to Axis.X or Axis.Y fails in the Cross Table, but works in other visualization types.
This is due to Cross Tables not using [Axis.X] or [Axis.Y], instead, use [Axis.Rows] and [Axis.Columns] in the expression