Why is my post code generation command not modifying the generated ARXML file?

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I am using the AUTOSAR Blockset to generate C code and an ARXML file from my Simulink model.
I would like to modify the generated ARXML via a post code generation command as mentioned in the following documentation:
https://mathworks.com/help/releases/R2025a/ecoder/ug/customizing-post-code-generation-build-processing.html
If this workflow works well for the generated C code, it doesn't work for the ARXML files.
How can I modify my ARXML with a post code generation command?

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MathWorks Support Team 2025-5-8

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This behavior is related to when we are generating the ARXML file. The ARXML file is generated in the "before_make" phase, located after the post code generation command. To learn more about the different phases of code generation, you can refer to this documentation page:

https://mathworks.com/help/releases/R2025a/rtw/ug/customizing-the-target-build-process-with-sl-customization-m.html

This leads to overwriting the changes made to the ARXML when they are made via a post code generation command.

In order to modify the generated ARXML, you can use commands in a user hook located in the "exit" phase.

You can learn more about how to register these functions in this documentation:

https://uk.mathworks.com/help/releases/R2025a/rtw/ug/customizing-the-target-build-process-with-sl-customization-m.html?#bqpb5tb