Why is TIM1 not available in CubeMX configurator?

[chriskuku]

I configured some devices (UART1, UART3, SPI1) in the .ioc file of an STM32F103 project.

Just wonder why TIM1 is greyed out and in italics, unavailable?

[chriskuku]

Found it. Had TIM1 configured in SYS as timebase source