Howto change the status of HU in coding?

Hi experts,

i found FM HU_STATUS_SET and set the if_activity = 'HU03' , handing unit information.

Before the execution, the status of the HU is I0513 and I0001(inactive).

But after execution of this FM, the status of the inputted HU was not updated. There is also no any error or exception.

I want to know how to use this FM? Or maybe there is any way else to change the status.

Thanks for reading.