Your page "STM32Cube Add CMSIS-RTOS" states in Step 4 "Remove Systick Handler" one should deactivate it in generated code by manually surrounding with "#if 0 #endif" sequence. Unfortunately this sequence will be deleted by STMCube on every new Generate Code. Question: Will deactivating "Time base: System tick timer" in STM32Cube, Configuration, NVIC also be ok. Doing so, a Systick handler code is no longer generated by STM32Cube. Best regards, Juergen.
Go on - give the link so that we can see the actual page in context.
Note that ST have a document UM1722: "Developing Applications on STM32Cube with RTOS"
www.st.com/.../en.DM00105262.pdf
Google would have given as first entry searching for "STM32Cube Add CMSIS-RTOS": www.keil.com/.../cubemx__r_t_x.html