KeepConstructionLine not working in V2

 From:  Samuel Zeller
3811.1 
Am I doing something wrong ?
But:

script:moi.geometryDatabase.getObjects().getConstructionLines().setProperty( "isTemporary", false );

Doesn't work with my V2 sadface -> :(
Is there any updated command for it ? I don't want to use the Paul custom script.