OMJJ New Movement type : Updating the Update Control/WM Movement type Tab

Hello,

I am trying to create a new movement type (Copy of 333 -> 933)

Within the update control tab, I want to create a new entry with movement indicator L.

I dont see where I can create a new entry, and the fields I want to change are grayed out.

Is there a way I can achieve this?

Any advice is greatly appreciated.

Regards

Ken