Where is the "Treat as atomic unit" option for Function-Call Subsystem?

I'm using the Function-Call Subsystem (Subsystem whose execution is controlled by an external function-call input - Simulink (mathworks.com)) in Simulink, and on its Block Parameters panel, it is written that "To enable parameters for code generation, select 'Treat as atomic unit'" (see screenshot). However, after walking through all three tabs on this Block Parameters panel, I can't find this 'Treat as atomic unit' option anywhere. Does anyone know where is this option placed?

Answer 1

[Jonas]

On my installation (R2020b) the 'Treat as atomic unit' is checked and greyed out. I believe a Function-Call Subsystem is always an atomic unit.

So the fact that the option is not visible for you is probably an issue on your end? Maybe you can try to access the property programmatically.

[Yingao Zhang]

Thanks, Jonas