Create a determination for the resource object

Hi experts,

Need to Default a few additional data into the resource object in TM /SCMTMS/VEHICLE_RESOURCE. Thus, I want to create a new determination attached to this object. I am using Transaction /BOBF/CONF_UI and go to the correct object and right click on the determination or on the node. I can see the menu Point "create Determination" but it is greyed out. Do I do something wrong or am I missing authorization?

Thanks in advance

Petra