How to remove custom faces in morph?

[YONGWOO KIM]

I want to change morph's material(surface).

I change material property in morph, but it's not work.

After morph is created, I check property in archicad.

It says 'Apply changes to custom faces/edges too'. (In picture)

This is occur when I did solid operation.

In memo, there is 'morphMaterialMapTable'.

I change that to false. And change material again. But, It's not work too.

I can not find parameter about custom face.

How can I change turn off or remove custom faces in code?