Revit 2023.1.1 classifications settings are not exported propperly

[EtiennevdBa]

Dear Revit/ifc team,

when i create a IFC file in Revit 2023.0.2 with the default exporter the classifications settings are exported propperly


when i export a IFC file in Revit 2023.0.2 with the opensource exporter 23.1.1.0 the classifications setting are not exported correctly

These issues are also in Revit 2023.1.1 with and without the opensource exporter.
are there more people with these issues?

Kind regards,

Étienne

[AngelVelezSosa]

I believe this is a known issue with Solibri that has already been fixed.

[EtiennevdBa]

I believe this is a known issue with Solibri that has already been fixed.

Dear AngelVelezSosa,

thanks for your response.
It's not Solibri related, when i open the IFC file in BIMvision i'm having the same issue.
Here is the same project in BIMvision with the classifications settings propperly exported:

Here it is not propperly exported:

Also tried the new 23.2.3.0 exporterd, same result:

Here are my classification settings within the IFC exporter:

what i don't understand is even with a filled in 'documentation location' there is other information in the IFC file.

If there is more information needed, please let me know.

[AngelVelezSosa]

I'll ask @WawanSolihin to check, but I think this might still be a viewer issue (#546, I think?)

[benjaminchvn]

Hi,

I am facing the same issue with classification, with Revit 2023.1 and IFC exporter 23.2.1.0.
Here are my classification settings :

I tested with a simple wall with "ClassificationCode" shared type parameter filled this way :

Here is the incorrect result with BIM Vision :

This is the same in Solibri :

It seems, as @EtiennevdBa noticed that IfcClassificationReference.Name and IfcClassificationReference.Location are not set up properly during export

[benjaminchvn]

Here is also the comparison of correct (with Revit 20) and incorrect export (with Revit 2023.1 and IFC exporter 23.2.1.0) with BIMCollab :

[louistrue]

@benjaminchvn @EtiennevdBa
Have a look here: #546
It's a mix of Revit doing something unusual and nearly all viewers having a bug where they dont read IfcClassification.Name but IfcRelAssociatesClassification.Name instead, which isn't the correct place to read the Classification Name from according to the IFC schema...

[WawanSolihin]

There seems to be a real regression bug also in Revit IFC exporter:

1. The classification reference name is not set correctly (It takes the classification name instead. "MyClassif" in the above example)
2. IfcClassificationReference.Location picks up the wrong value (from the default or previous value of Uniformat.
3. In IFC4 export it may not export the classification

I will log a defect on this issue.

[benjaminchvn]

Thanks ! Hope this can be fixed.
I was also wondering if there is any way to override the Defaut Classification (Uniformat) associated with the use of built-in Revit assembly code (Name, Source and Edition) :

So far the only way I have found is to manually edit the IFC in notepad....

[EtiennevdBa]

@benjaminchvn well, editing the IFC in notepad is quite fun.
I hope that there will be a fix soon :)

[JOuellette-Autodesk]

https://jira.autodesk.com/browse/REVIT-200324

[WawanSolihin]

Thanks ! Hope this can be fixed. I was also wondering if there is any way to override the Defaut Classification (Uniformat) associated with the use of built-in Revit assembly code (Name, Source and Edition) : So far the only way I have found is to manually edit the IFC in notepad....

What exactly are you trying to override this?

[benjaminchvn]

Hi, in this case I am using Assembly code in Revit to fill in Uniformat classification code, but version II 2015, so source and edition are not correct.

[WawanSolihin]

Hmm, currently the Uniformat classification information is hardcoded based on the version Revit has internally and therefore cannot be overridden.

[xpt5]

If it sheds some light over the issue, the problem also can be found with Revit 2022.1.1 and the following Ifc Exporter versions:

• v 22.6.0.0
• v 22.5.1.0

BUT in the v..22.5.0.0 there isn't any issue with the Uniformat Classification export.

[canpolatbaris]

Hi,
I have the same issue in Revit 2022 (IFC Exporter 22.6.0.0) and Revit 2023 (IFC Exporter 23.2.3.0).
I don't think this is a viewer issue.

Also, I exported one of the old projects, which had the right classification assignment before, and could not export classification in the right way.
I tried previous versions one by one, and version IFC.for.Revit.2023.1.0.0.msi exports classification for the same model properly.

[WawanSolihin]

It has been fixed in the development version, but it did not make it for 22.6.
I can bring it forward to 2022 and if you do not mind unsigned build, it can be done soon.

[WawanSolihin]

I bring forward the fix for the classification issue. There are pre-release (not signed) versions for Revit 2022 and Revit 2023 that you may want to test it out. In my testing they seem to work well.
For Revit 2022: https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v22.6.1.0
For Revit 2023: https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v23.2.4.0

[EtiennevdBa]

I bring forward the fix for the classification issue. There are pre-release (not signed) versions for Revit 2022 and Revit 2023 that you may want to test it out. In my testing they seem to work well. For Revit 2022: https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v22.6.1.0 For Revit 2023: https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v23.2.4.0

@WawanSolihin Thanks for the pre-release. i've tested them to and its better, but the Name is missing

This is how it was before

[WawanSolihin]

It works well in my test. I attached the sample file here. Assembly.0.2 (as identified by Solibri) shows the result as expected. (The Solibri version I use: 9.12)

Classification-test--2022.zip

[benjaminchvn]

I bring forward the fix for the classification issue. There are pre-release (not signed) versions for Revit 2022 and Revit 2023 that you may want to test it out. In my testing they seem to work well. For Revit 2022: https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v22.6.1.0 For Revit 2023: https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v23.2.4.0

Hi thank you for this pre-release. I have been testing out on both Uniformat (using Assembly code in Revit) and custom classification using a shared parameter, it seems to work fine.

[EtiennevdBa]

It works well in my test. I attached the sample file here. Assembly.0.2 (as identified by Solibri) shows the result as expected. (The Solibri version I use: 9.12)

Classification-test--2022.zip

@WawanSolihin, thanks for your reply, i'm using solibri 9.13.1
will check tonight with a different Solibri version. keep you posted.

[canpolatbaris]

It has been fixed in the development version, but it did not make it for 22.6. I can bring it forward to 2022 and if you do not mind unsigned build, it can be done soon.

thank you, I will start my tests today...

[louistrue]

Thats great, @GerbenB-KUBUS
Happy to help: [email protected]

[koenmeinema]

Perfect Gerben, i would love to help as well: [email protected]
Feedback i will post here if that is ok.

[EtiennevdBa]

@AngelVelezSosa can you give us a update on this issues?

thanks in advance

[JoepvanMotman]

I'm also still having this issue. Assembly description is not getting exported to IFC. It has nothing to do with the viewer i guess since the descriptions are also not found when i search for them in notepad.

[koenmeinema]

@AngelVelezSosa could you please give us an update? Also the overwrite function in IFC Export > Modify > Property Sets > Classification Settings doesn't work as it should.

[AngelVelezSosa]

@koenmeinema split out the last issue as this one is getting confusing due to multiple different problems, some already addressed. Is the question for an update on 2022?

[koenmeinema]

@AngelVelezSosa the issue Assembly Description not showing. In the past it was shown correctly in multiple IFC viewers as:

Uniformat Classification: [Assembly Code], [Assembly Description]

Now it's shown wrong as:

Uniformat: [Assembly code], Uniformat

[AngelVelezSosa]

In all versions or 2022?

[koenmeinema]

@AngelVelezSosa I tried 2023 and 2024

[JoepvanMotman]

Hi @AngelVelezSosa there are several serious problems with Revit 2023 and 2024 when it goes to exporting any kind of classification. I have also send you some e-mails with models showing the issue. I think you did not yet find the time to answer those mails.

At this moment our company cannot work with Revit 2023 and 2024 since a lot of Clients require those classifications. The classiciation discription is nog getting exported and that has nothing to do with a viewer. When i search the IFC file in notepad i cannot find the descriptions.

I have tried everything. Just Revit 2023 / 2024 without or with any kind of IfcExporter from github. It is not working.

[AngelVelezSosa]

Yes, sorry, we have been working against some deadlines. I will revisit the classification issue to see what we can do.

[dvrvb]

Hi Angel,
I attached a simple model sample.
2024-01-13_R2022-R2023-R2024_classification.zip

I tested it for (the current versions of) R2022 2023 2024, for (the current versions of the IFC exporter) for IFC2x3CV2.0 and IFC4RV1.2.
It seems that for 2022/3/4 the description is missing (only) for IFC2x3.

Regards,
Dirk

[dvrvb]

Next to this issue, there is also a Solibri issue, because Solibri is only showing the attribute "Name" and not the "Description"...

[koenmeinema]

Dear Angel,

Could you please give us an update? Still waiting for improvements...

With kind regards,

Koen

[AngelVelezSosa]

We have plans to look at this in the near future.

[t-vasyi]

The fix for the issues reported in this thread will be included in the next IFC Exporter releases.
Please, let me know if you still have any classification issues
Thanks

[koenmeinema]

Great, thanks! Do you have a download link so I can test?

[JoepvanMotman]

@t-vasyi thank you. When will the update be released? Also, did you test if this fixes the issue in all Revit versions? For as far as i know this issue is happening in RVT23 en RVT24.

[xpt5]

@koenmeinema the latest exporter version for 2022 is here https://github.com/Autodesk/revit-ifc/releases/tag/IFC_v22.7.0

[AngelVelezSosa]

I don't know if this fix made the 2022 cut-off, @o-babii ?

[AngelVelezSosa]

To the other questions, we don't publish release dates, but in general we hope to include in a future release for all supported versions. We always do have to balance future work and back-submissions, and not everything can be back-submitted, but these changes I believe are eligible.

[o-babii]

Unfortunately, version 22.7 does not fix this bug, the exported classification looks the same as for the previous version 22.6.2

[t-vasyi]

@t-vasyi thank you. When will the update be released? Also, did you test if this fixes the issue in all Revit versions? For as far as i know this issue is happening in RVT23 en RVT24.

yes, fix works for all the versions

[t-vasyi]

The fix wasn't included to 22.7

[aksel-a]

Hi there! I'm running R24 with the latest release of IFC exporter and the classification problem persists. What I can add is that I lost the ability to map Assembly Code and Assembly Description to a custom PSet, as I was doing before.

Any chances there is already a solution? I wasn't aware of this issue, would it be good to report it in the log of the IFC-Export Releases, isn't?

[xpt5]

Hi @aksel-a, you are mentioning two Revit type parameters. Did you adapt the custom Pset txt file to consider IfcElementType?
I had the same issue, check this

[JoepvanMotman]

@AngelVelezSosa @t-vasyi

I was wondering when this issue is finally getting fixt? Still the Assembly Description is not getting exported when using RVT 23.

[t-vasyi]

The fix for the issues reported in this thread will be included in the next IFC Exporter releases. Please, let me know if you still have any classification issues Thanks

The fixed Jira ticket is REVIT-219651

It is included in:
Release 25.2 for Revit 2025
Release 24.2.20 for Revit 2024
Release 23.X for Revit 2023 (upcoming)

Not included in Release 22.7 for Revit 2022

If you are still facing issues using one of these Releases, please share a simple model + exported IFC file.
I think it is also a good idea to create a new thread in this case.

Regards,
Ihor Vasyliev

[koenmeinema]

Hi @t-vasyi,

I tried it with Revit 24.2.20 and it finally works like it should! Thanks.

Kind regards,
Koen