How to chop hierarchical ROD object?

 Hi all!

Could you pls. help me with chopping of the rod objects. The question is I have Instance with RodObject.

 To find this object inside instance I use rodGetOb:

 cv = geGetEditCellView();

gRing = rodGetObj("GuardRing1/GuardRing" cv); Where GuardRing1 - istanceName, GuardRing - name of the rod object;

after that, I  catch all layer on top level and take only m1 layers:

 metStripes = setof(i cv->shapes i->lpp == list("m1" "drawing"));

find m1 path rings in rod object:

 m1SubPath = setof(i gRing->subShapes car(i->lpp) == "m1");

after that, finding common part (metal intersection)  and calculate centerline point and try to make chop, for example:

 rodAddMPPChopHole(gRing list(44.44:19.36 44.44:18.85));
 

But have in CIW following warning:  *WARNING* rodAddMPPChopHole: objId rodObj:0x14b6a18c: hierarchical ROD object not allowed - name is "GuardRing1/GuardRing"

And nothing happend :(