Basically "leDefineMPPTemplate"  and "rodCreatePath"  command's syntax are similar 

;*********************************** Syntax of  "leDefineMPPTemplate" ********************

tech=techGetTechFile(geGetEditCellView())

leDefineMPPTemplate(
               ?techId  tech
               ?name    Multipartpath_Name  ; it should be a string
               ?layer   list("prBoundary" "drawing") ; Master layer name normally set it to prBoundary
               ?width   MPP_Width
               ?choppable       t
               ?endType         "flush"
               ?beginExt        0.000000
               ?endExt  0.000000
               ?justification   "center"
               ?offset  0.000000
               ?offsetSubPath   offsetSubPath_list
               ?subRect         SubRect_list
       ) ; end of leDefineMPPTemplate 


 ;******************************** Syntax of "rodCreatePath" ******************************

layername=list("prBoundary" "drawing")
Points=list(list of points)
rodCreatePath(
               ?name MPP_Name  ; it should be a string
               ?layer layer_name ; this is the master layer name
               ?pts Points
               ?width layer_Width ; master layer width
               ?justification "center"
               ?cvId cv
               ?offsetSubPath  offsetSubPath_list
               ?subRect        SubRect_list
       ) ;end rodCreatePath


only difference in "rodCreatePath" is you have to pass the Points of the MPP to the ?pts field, which is done by enterPath() function.
I hope this will solve your problem.

please refer "sklayoutref.pdf"  to learn more about these commands