Cannot pick 'procedural layer' for point shapes in Arcgis Pro, cannot apply CityEngine rule pack

LessieOC

Hello, I created a rule package which uses CityEninge's tree library. I added the additional annotations so it would work in ArcGIS pro. (little cga code below). I want to generate the trees in ArcGis Pro using the 'procedural layer' option, which I should be able to select from the symbology > Properties drop down, right?  but this option does not appear. I only get marker, stroke and fill layer options. How I can assign the rule package to point shapes?.  The point data I have is a the city's vegetation in shape file. Using arcgis pro 1.3

I tried converting converting the points to multipatch but then, the rpk does not apply since it is annotated with @InPoint. So, I would need an annotation for @Multipatch????? Using the preset option forces using a single color.

the code below is a minimized version. In reality it calls other 2 little cga files, but for testing I took may sections out. 
I guessed the order of how the additional annotations should go, so I am not entirely sure.. pls advise if this is wrongly done, too.

import Tree_Options: "rules/Esri Vegetation Library with LumentRT 3D Plants - Plant Loader.cga"
#import Root_Options:"rules/aoi_roots.cga"
#import LOD1_trees:"rules/aoi_lod1_tree.cga"

#   Inspector - Trees  ##############################

@Order(1) @Range("Cylinder","Lollypop","Fan","Analytical","Model")
attr Representation        = "Analytical"

@Group("Trees",1)
    @Order(1)
    attr Genus        = "Robinia"    
    
    @Hidden
    attr Species    = "Pseudoacacia"
    
    @Order(2)
    
    @Distance
    @Range(0,30)
    @Description("Change diam 0-30m")
    attr Canopy_Diameter     = 8
    
    @Hidden
    @Distance
    @Range(0,160)
    attr Radius = Canopy_Diameter/2
    
    @Order(3)
    @Distance
    @Range(0,160)
    @Description("Change 0-160m. Red trees have H<0")
    attr Height     = 10
    
    @Order(4)
    @Range(0,1)
    @Description("between 0 to 1")
    attr Transparency         = 0

################## START

@StartRule @InPoint
    
load --> loadTrees

loadTrees -->

    set(Tree_Options.Name, Tree_Options.getCommonName(Genus,Species))
    set(Tree_Options.Radius,case Canopy_Diameter >0: Canopy_Diameter/2 else: Tree_Options.getRadius)
    /* set(Tree_Options.Height,case Height<0: 10 else: Height) drawRedCylinder
    Tree_Options.Generate */
    set(Tree_Options.Height,case Height<0: 10 else: Height) Tree_Options.Generate
   

LessieOC

I just had to drag the 2D layer into the 3D layer. I can now apply the cga rule but the geometry is missing. I get the white unkown assets cubes instead.

The .rpk is not including the geometry which is called by the first line in the cga code. How to I force the geometry in the rpk?

thanks