setJointWithNext does not work like expected

[sanostol]

I want to generate spare parameters and join some lines, but I can not get it to work, the join_with_next arguement does not work and the function "setJoinWithNext" also does not. What's wrong here?

filetemplate = hou.StringParmTemplate( "file", "File", 1, default_value=("",), string_type=hou.stringParmType.NodeReference, join_with_next= True)
issequencetemplate = hou.ToggleParmTemplate("issequence", "Sequence", default_value=False, join_with_next=False)
filetemplate.setJoinWithNext(True)

n.addSpareParmTuple(nodetemplate, in_folder = ("Caches",))
n.addSpareParmTuple(issequencetemplate, in_folder = ("Caches",))

thanks a lot

Martin