Set analytical column Z Projection parameter

Revit
5

Yna_Db is correct, it’s read only and you need to use the SetProjection Method in a python node.

Here is an example of how to use the method:
element.SetProjection(AnalyticalElementSelector.EndOrTop, StickElementProjectionY.LocationLine, StickElementProjectionZ.Bottom)

Here is a complete working code:
image

import clr

# Import Revit API
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Structure import *

# Import DocumentManager and TransactionManager
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument

# Input
elements = UnwrapElement(IN[0])
if not isinstance(IN[0], list):
	elements = [elements]
 #Make changes to Revit DB in a Transaction
TransactionManager.Instance.EnsureInTransaction(doc)
for element in elements:
	element.SetProjection(AnalyticalElementSelector.EndOrTop, StickElementProjectionY.LocationLine, StickElementProjectionZ.Bottom)
TransactionManager.Instance.TransactionTaskDone()

OUT = 0
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