If this issue is not a bug report or improvement request, please check the Dynamo forum, and start a thread there to discuss your issue.

Dynamo version

2.x

Revit version

Any two recent versions of Revit, e.g. 2018 and 2019

Operating system

Windows 10

What did you do?

Steps to reproduce:

• start a 2.0 graph in Revit 2018
• Place a Categories node and choose Walls from the dropdown
• save the graph
• open Revit 2019
• load the graph
• the Categories node now points to something totally differeny

What did you expect to see?

The exact same category selection between versions

What did you see instead?

Something else

This happens because the dropdown is serialized as just and index integer in the JSON, where as built-in categories are not static between Revit versions.

I imagine one way to solve this is to store the current selection as both a string and an index.