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"Active Document is Not a Part Document" Issue in Autodesk Inventor
Dear all,
I hope this message finds you well. I am writing to seek assistance regarding an issue I’ve encountered while trying to programmatically interact with Autodesk Inventor via Python scripts using the Inventor API.
Problem Description
While attempting to process a Part Document (.ipt) using the API, the script consistently returns the following error:
"Active document is not a Part Document. Please open a Part (.ipt) file."
What I Have Tried
- Verified that the correct file (Part.ipt) is located in the target directory.
- Manually opened the Part Document in Autodesk Inventor before running the script.
- Attempted to explicitly activate the Part Document in the script using:pythonCopy codepart_doc = inventor_app.Documents.Open(part_file_path) inventor_app.ActiveDocument = part_doc
- Confirmed the document type with:The result is 12290, which doesn’t match the expected value for a Part Document (2).pythonCopy codepart_doc.DocumentType
Environment Details
- Autodesk Inventor Version: 2025
- Python Version: 3.13.1
- Operating System: Windows 11 Pro
- API/Library: PyWin32 for COM interaction
Expected Behavior
The script should identify the active document as a Part Document and proceed with further processing without errors.
Request for Assistance
Could you please advise on:
- Whether the document type 12290 indicates a specific issue or misconfiguration?
- Steps to ensure the Part Document is correctly recognized by the API.
- Any additional settings or adjustments required in Autodesk Inventor for seamless API interaction.
If necessary, I can provide sample code or additional details about the environment and workflow.
Thank you for your time and support. I look forward to your guidance on resolving this issue.
Best Regards,
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Hi @svloFNWW9
I would have thought it unnecessary to set the active document = to itself as this might have unintended outcome.
For the number this is the enum value for the part document which checks out.
| kPartDocumentObject | 12290 | Part Document |
You should be able to use from this point on
The set variable part_doc
Or if this helped you, please, click (like)
Regards
Alan
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I do not know python but i do not really understand if you did it correctly here :
part_doc = inventor_app.Documents.Open(part_file_path) inventor_app.ActiveDocument =part_doc
active document is read only:
maybe it should be :
part_doc = inventor_app.Documents.Open(part_file_path)
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The "Active Document" is the file that is currently selected and opened in Inventor. If that file is not a part document, you will get this error.