topic Frame Part numbers regenerating without length change - Inventor 2026 in Inventor Forum

Frame Part numbers regenerating without length change - Inventor 2026

B-rad1011 — Tue, 30 Sep 2025 14:52:10 GMT

We recently upgraded to Inventor 2026 and after doing so, we have had frame generated members updating part numbers unexpectedly. We upgraded from 2023 and do not recall this behavior from then.

What happens is when we have a frame generated member with a feature like a hole, we will add a letter on the end of the part number to cause it to be unique from other same length members in the drawing BOM.

In 2023, that part number would only change if the length to that member was changed. However now, it appears that if any member has treatments done to different members and those members change/move, it will revert the part number even though the length of that member has not changed. Below, all I did was move the same length channel via the sketch, and it reverted the part number of the channel with the hole.

This is making it a huge pain for large structural assemblies as it reverts tons of frame generated pieces even though changes have not been made to those pieces. Is this something that needs to be looked into or is there a setting that we are missing? Appreciate any help.

@B-rad1011 Your post title was modified to add the product name and version and to increase findability - CGBenner

Re: Frame Part numbers regenerating without length change

johnsonshiue — Mon, 29 Sep 2025 21:55:37 GMT

Hi! I could be wrong but I vaguely remember this was a known bug, which had been fixed in later updates. Please install 2026.1.1 update. If the issue still persists on 2026.1.1, please share them in zip here or send it to me directly at johnson.shiue@autodesk.com. I would like to understand the issue better.

Many thanks!

Re: Frame Part numbers regenerating without length change

B-rad1011 — Tue, 30 Sep 2025 13:15:41 GMT

Hello! I currently have 2026.1.1 installed and the issue still occurs for me (I installed the update a couple days after it was released). I have attached the assembly zip of the snips above where changing any of the 3 dimensions not tied to the length of the shorter channels will result in the removal of "_A" on the channel with the hole.

Re: Frame Part numbers regenerating without length change - Inventor 2026

Steven_Gao — Fri, 03 Oct 2025 18:06:34 GMT

Hi @B-rad1011 thanks for reporting this problem! I can reproduce it on 2026.1 build and I have logged an internal defect(INVGEN-87262) to ask development team for further investigation.

Thanks,

Re: Frame Part numbers regenerating without length change - Inventor 2026

alesricar — Wed, 12 Nov 2025 10:00:00 GMT

While it could avoid update part number for frames connected with end treatment where length do not change there is no quarantee that Frame Generator keeps customization of part number (stock number) in other scenarios.

In case you wish to customize part (or stock) number you may customize the content center data. You can also consider turn off "Use Part Number from Content Center" option in Insert/Change Frame panel.