Using toplevel('ils) in an ocean script causes undefined variable errors

I'm trying to run a load pull test using Ocean. If I set the toplevel environment to Scheme mode (ils), the script generated by ADE breaks due to scoping errors. Is there any way around this?

This is valid ocean code.

    constantPowerContours = cPwrContour(...)
    plot( constantPowerContours ?expr '( "Constant Power Contours" ) )

while this code breaks

    toplevel('ils)

    ...

    constantPowerContours = cPwrContour(...)
    plot( constantPowerContours ?expr '( "Constant Power Contours" ) )

and gives the following error on IC 6.1.6

    *Error* eval: unbound variable - myVar1

Any ideas?