Cannot select Lattice2 Object, with the Link Popup, by clicking on it in the Objects Tree.

[leoheck]

I cannot update the Placement object manually; it seems that nothing is added to the property when I clear the field and select it from the object three.

Does this is supposed to work?

Initially, I had this Closing_Boss_1, but now I want to update it with the Closing_Bosses_1, which is now an Array of placements.

[leoheck]

Ah, I see. When I click on the ellipsis on the PLacements To field, it launches this Link pop-up.
Then I used to be able to click on the object using the Object Tree, since that Link Pop-up is a bit of a mess.
If I do that, with the Lattice2 objects, nothing is selected on that Pop-up. However, this works with other objects.

[leoheck]

Watch this.

Screencast.From.2025-10-29.16-53-44.mp4

[leoheck]

It seems it complains about something.
I am not sure it is related since the time is 10 minutes ago.

16:45:49  pyException: Traceback (most recent call last):
  File "/home/lheck/.local/share/FreeCAD/Mod/lattice2/./lattice2PDPattern.py", line 212, in execute
    result = self.applyTransformed(selfobj, baseshape, None, mts)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lheck/.local/share/FreeCAD/Mod/lattice2/./lattice2PDPattern.py", line 253, in applyTransformed
    placements = lattice2BaseFeature.getPlacementsList(selfobj.PlacementsTo, selfobj)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lheck/.local/share/FreeCAD/Mod/lattice2/./lattice2BaseFeature.py", line 383, in getPlacementsList
    if not isObjectLattice(documentObject):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lheck/.local/share/FreeCAD/Mod/lattice2/./lattice2BaseFeature.py", line 85, in isObjectLattice
    if documentObject.isDerivedFrom('App::Placement') or documentObject.isDerivedFrom('PartDesign::CoordinateSystem'):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<class 'AttributeError'>: 'NoneType' object has no attribute 'isDerivedFrom'
16:45:49  Closing_Boss_1: 'NoneType' object has no attribute 'isDerivedFrom'

[DeepSOIC]

Seems to be a FreeCAD bug.
it seems to be caused by the fact that the LPDP object is in a body. I can reproduce it with Part Offset2D and two sketches packaged into a Part:

edit-linkprop-test.zip (edit Offset's Source property)

but there was a point where it did work but in Lattice2 Populate it didn't. It is strange, not exactly repeatable.

[leoheck]

Yeah, it indeed seems to be a FreeCAD bug. I will test this a bit more to open an issue there later. Thanks for confirming this issue.

[DeepSOIC]

btw, you might like Replace Object tool from my other addon, Part-o-magic.

[leoheck]

Like to replace one Sketch with another? I used to use that functionality from Part-o-magic.