Autodesk / Autodesk/revit-ifc

PR: Wrong EPSG-code when entering in GUI

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problem
Dominant language
C#
Stars
637
Forks
225
PR merge metrics
No merged PRs in 30d

Description

### Problem Description

When entering an ESPG-code in the GUI (in my case 3011, SWEREF 99 18 00) an incorrect code appears: EPSG:6619. I have no problem with Utah (NSRS11.UT-C), but unfortunately this incorrect code comes through in the IFC-file:
![RevitIFC4exportGeoref](https://github.com/user-attachments/assets/b0bf0594-3166-48dd-b6f6-20dc09d72a16)
This seems to happen irrespective of what EPSG code that I try to reference, but I haven't tried all of course. Same issue in Revit 2022.7: IFC 22.77.0.0, Revit 2024.3: IFC 24.2.0.0 and Revit 2025.3

### Revit Version

2024.0.x

### IFC for Revit Addon Version

24.x.x

### Windows Version

11 22H2

Contributor guide

Open the contributing guide

Research direction

Start by reproducing the GUI entry of EPSG:3011 (SWEREF 99 18 00) in a supported Revit version and inspect the generated IFC file. Compare the entered code with the emitted EPSG:6619 value; done means the IFC preserves the selected EPSG code across the reported Revit and addon versions.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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