Cannot save AAS which has an Operation in Submodel Template

[STUBA-rupr]

Describe the bug
After I add an Operation under a Submodel template I cannot save the AASX file, and cannot do check validate fix as well.

To Reproduce
Steps to reproduce the behavior:

1. Get for instance AAS from IDTA 02008-1-1_Template_withOperations_TimeSeriesData.aasx
2. Add a new Operation to the submodel e.g. Oper01
3. Try to save

Expected behavior
I would expect that aasx file is updated. But it is not the case.

Screenshots

Desktop (please complete the following information):

• OS: Windows Server 2022
• Browser Edge, Chrome
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[STUBA-rupr]

I figured out that there MUST be defined at least ONE INPUT, ONE OUTPUT and ONE IO.
Then it is possible to save the AASX.

[wiresio]

See also: admin-shell-io/aasx-package-explorer#635

And thanks for the hint!

[MichaelHoffmeisterFesto]

In this branch I added a fix: https://github.com/admin-shell-io/aasx-package-explorer/tree/MIHO/TMV30_SAMM_Xmas2023
See: https://github.com/admin-shell-io/aasx-package-explorer/commit/f3cf9337f1668f41735be271eeed068ba3d63148
Changes to: src/AasxCsharpLibrary/Extensions/ExtendISubmodelElement.cs
Right now, I dont known when it is integrated to the main brnach.

[wiresio]

Thank you @MichaelHoffmeisterFesto - it is working for me!

[STUBA-rupr]

Thank you as well, nice Xmas gift!

[wiresio]

Should be kept open since it is not yet merged into main!