dbLayerOr and dbLayerAndNot Issue

Hello, 

I am facing some problem while using dbLayerOr and dbLayerAndNot. I wrote the following script to remove the overlapping part between two shapes. It workes nicely for any regular polygons. But, when I want to use it for removing overlapping content from a circular/arc shape object, the resultant layout is not circular anymore. It becomes a polygon (see the attached snapshot). I tried to use x_numVertices as 10000. But, it seems it does not work beyond a certain value. 

If you have any idea about how to fix this, that will be a great help for me. 

; Remove ONLY any overlapping regions from ovlplist

*/

procedure( RK_removeoverlaps(wg_list ovlplist @key (cellview nil) )

let( ( shapelist layer shape )

when( cellview == nil
cellview = geGetEditCellView() ; dbOpenCellViewByType("RK_compLib" "test" "layout" "" "a")
)

shapelist = nil
foreach( shape wg_list
shapelist = dbLayerOr(cellview "tempLay0" list(shape) shapelist)
)

foreach( shape ovlplist
layer = shape~>layerName
dbLayerAndNot(cellview layer list(shape) shapelist)
dbDeleteObject(shape)
)

); end let
); end procedure