How to Replace/Update UDL in Robot?

I'm pushing BarUniformlyDistributedLoad to Robot. Ideally, I'm expecting every push is to replace/update the existing UDL. But what happens is that every time I toggle the button, a new UDL is pushed, in addition to the exiting one.

Any help on how to push the UDL to replace/update the existing UDL?

Alternatively, if the above doesn't work, anyone have idea on how to remove the existing loadcase in Robot before pushing a new one?

Thanks in advance.