Changes in Stateflow Subcharts Won't Save

Mike Sprengel

2020 11 17

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I just upgraded to 2020b and now it appears I am unable to save certain changes to subcharts within Stateflow, details:

Changes in text-based code on the top level of the chart save.
Changes in the stateflow structure (e.g. adding a new state) within a subchart save.
Changes in text-based code in a subchart reverts back to its original form after saving and restarting.

I originally built the model in 2017a and it functioned correctly before upgrading.

Currently installed toolboxes:

MATLAB Version 9.9 (R2020b)

Simulink Version 10.2 (R2020b)

Embedded Coder Version 7.5 (R2020b)

MATLAB Coder Version 5.1 (R2020b)

MATLAB Compiler Version 8.1 (R2020b)

MotoHawk Code Generation Toolbox Version 2020b_beta3.2704

Simulink Coder Version 9.4 (R2020b)

Stateflow Version 10.3 (R2020b)

I’ve tried to reimport the chart from a working 2017a version but it didn’t fix the issues. Anyone have any ideas on how to correct this?

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Mike Sprengel 2020-11-17

After further review it does not appear that Stateflow is detecting a change in the model when I modify the text within a subchart (an asterisk is not added after the model name). I can get around this by right clicking on the state, going into properties, and modifying the label text. Looks like it may be a bug in the code.

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