IV2026 Cyclical Constraint Dependency Was Detected

[YannickEnrico]

Hey there

Can someone explain this behaviour?

Even changing the EoF causes this on sketch4.

I'll attach the part here

[Logos_Atum]

Hello,

why is this a derived feature?

[YannickEnrico]

Sorry if I'm a bit slow, but where do you detect a derived feature?

[JDMather]

@YannickEnrico 

Why are you using Split (Bodies) on a sheet metal part?

Edit: Never mind, I tried converting to standard part and use Extrude rather than Face and I still got the error on rebuild.

I tried starting over from scratch a standard part and still see the issue.

[kacper.suchomski]

All attempts show this error, including Direct Edit and Thicken.

[johnsonshiue · Accepted solution]

Hi Yannick,

This is a bug. It should work. The warning seems excessive. I will work with the project team to understand it better.

Many thanks!

[YannickEnrico]

Hi @JDMather 

First, I'm a big fan of multi-body parts in the sheet metal environment, so it's just a force of habit.
Second, first I was told the customer wanted this (unsplit), but then they wanted it split with keyhole interlocking, which was what I attempted to implement when the error was demonstrated

[YannickEnrico]

It appears to be a result of the split. Any further changes to the part after that seem to be out of the question.

It appears to be tied to where the split is placed. Choosing a plane with an offset of 0 from the origin plane causes the same issue, but choosing one that is 0,001 mm offset works as intended.

[YannickEnrico]

Hi @johnsonshiue 

I moved my sketch by removing the projected geometry constraint on the center point -> Projecting a new center point -> Aligning the sketch differently.

This operation demonstrated an extra bug, and confirmed the bug tied to splitting the circular feature in the middle.

The sketch lines now show as light blue despite actually being fully constrained. I've attached a new version of the model

[YannickEnrico]

And meanwhile, drawing it this way works instead

[johnsonshiue]

Hi Folks,

This is absolutely a bug. I am able to reproduce it on Inventor 2020 also. It seems to be there for a while. It has been reported as INVGEN-84162.

Many thanks!

[Logos_Atum]

Hi,

just got time to read this. I tried the part in Inventor 2024 with the interoperability tools for 2026 files and got a derived feature. The requested operation did not work that way either.

best regads

Daniel