Object Merge SOP, new node references the selection

# define
offsetx = 3
offsety = 0
color = hou.Color(0.0, 0.0, 0.0)

node_src = hou.selectedNodes()[0]
name_src = node_src.name()
name_src = name_src.split("_")[-1]

posx = node_src.position()[0] + offsetx
posy = node_src.position()[1] + offsety

#create, name, pos
container = node_src.parent().path()
name_mrg = "IN_" + name_src
node_mrg = hou.node(container).createNode('object_merge',name_mrg)
node_mrg.setPosition( [posx,posy] )

#parm
path_src = node_src.path()
parm = node_mrg.parm("objpath1")
parm.set(path_src)

#setcol
node_src.setColor(color)
node_mrg.setColor(color)