Level Parameter Bug - Read only

Revit
4

I’ve experienced this same behaviour as well and couldn’t get around it with the OOTB nodes.
I finally solved it by using some python code.

You can use this:

blob.jpg1277×708 317 KB

with the following python code:

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument

element = UnwrapElement(IN[0])
ref_level = UnwrapElement(IN[1])

TransactionManager.Instance.EnsureInTransaction(doc)

for i,x in enumerate(element):
	ref_levelid = ref_level[i].Id
	
	object_param_level = x.get_Parameter(BuiltInParameter.FAMILY_LEVEL_PARAM)

	object_level = doc.GetElement(object_param_level.AsElementId())

	object_param_level.Set(ref_levelid)

TransactionManager.Instance.TransactionTaskDone()

OUT = element