Multichannel bug: Topology error when GND connectivity varies on sheet's external nodes

Hi,

Multichannel placement (no routing or zones done yet, just component location) gave me a “Topology error” on the 3rd out of three replicas for no apparent reason. Internal component names are not the issue, that is, letter-digit format without underscores or the like.

What triggers the failure is when I connect GND differently on the sheet’s hierarchical nodes. That is, any signal on external node “A” and GND on external node “B” of all sheets works. But change one replica’s external node “A” to “GND” and I get a “topology mismatch” in Tools/Multichannel/Repeat layout.

Thought I’d pass this one on (awesome feature, BTW).

EDIT: Even a missing GND connection causes Topology error, it seems. Net ties to the rescue (outside the replicated sheet on any node that is potentially GNDed)

Just for the record if someone else reads this, hierarchical multichannel operation is apparently not supported (yet). So the replicated design needs to be “flat” without sub-sheets (happy to be corrected…)

Version as below:
Application: KiCad Schematic Editor x64 on x64
Version: 9.0.1, release build
Libraries:
wxWidgets 3.2.6
FreeType 2.13.3
HarfBuzz 10.2.0
FontConfig 2.15.0
libcurl/8.11.1-DEV Schannel zlib/1.3.1
Platform: Windows 11 (build 22621), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) UHD Graphics, 4.6.0 - Build 30.0.101.1122
Build Info:
Date: Mar 30 2025 01:11:30
wxWidgets: 3.2.6 (wchar_t,wx containers)
Boost: 1.86.0
OCC: 7.8.1
Curl: 8.11.1-DEV
ngspice: 44
Compiler: Visual C++ 1942 without C++ ABI
KICAD_IPC_API=ON
Locale:
Lang: en_US
Enc: UTF-8
Num: 1,234.5
Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)

Please attach an example project or at least illustrations.

That is fixed in the 9.0 nightly builds, and will be in the 9.0.2 release.

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