Why is "Navigate to C/C++" greyed out?

I am trying to use the Code Perspective to analyse where certain variables within my Simulink block diagram are located in the resulting C code. I can succesfully click on code line numbers in the C code panel and Simulink navigates to the corresponding Simulink blocks.

Unfortunately, the reverse does not seem to be possible. When I right-click on a block and go to C/C++ Code > Navigate to C/C++, this option is greyed out.

Does anyone know why this happens and how I can enable it?

[Akshaya]

I have the same issue.

Any answer?

Thanks in advance!