This is weird, API docs says it has such a method: FamilyInstance Methods
Still, Dynamo claims it does not:
this is Revit 2021.4 and Dynamo 2.6
maybe it is a library issue use the template:
import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Structure import *
clr.AddReference('RevitAPIUI')
from Autodesk.Revit.UI import *
clr.AddReference('System')
from System.Collections.Generic import List
clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.GeometryConversion)
clr.ImportExtensions(Revit.Elements)
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
uidoc=DocumentManager.Instance.CurrentUIApplication.ActiveUIDocument
#Preparing input from dynamo to revit
element = UnwrapElement(IN[0])
#Do some action in a Transaction
TransactionManager.Instance.EnsureInTransaction(doc)
TransactionManager.Instance.TransactionTaskDone()
OUT = element
https://primer.dynamobim.org/10_Custom-Nodes/10-6_Python-Templates.html
you have also to Unwrapping your elements!
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@Draxl_Andreas Thank you for your answer and suggestion!
I saw what’s wrong:
Had to Unwrap the list (just like you said) and then actually extract the value from that parameter 
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This article look at the issue of unwrapping revit elements and why it is required (sometimes).
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That’s a nice comparison 
me too, actually…
Where is that link?
yeap, I was curious also
Dynamo DACH Usertreffen 8.12.2020 I Autodesk - YouTube @jacob.small @danail.momchilov
When i would write a manuel for dynamo and Revit API. Maybe you would have been any ideay of it, BUT you would be a great Cook
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That is hands down my favorite diagram for unwrapping ever. It should definitely be in the Dynamo Primer in and future incarnations if not. Needs a ‘forgot to unwrap’ diagram too showing a sad banana sitting in an icecream bowl with skin on.
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