Crossprobing is supported only on the corrosponding simulation view. So you have to click in the analog_extracted view. If you would click in the schematic view there is in the case of a RC extraction no direct corrospondence between schematic nodes and extracted nodes. So a single schematic node could have many extracted nodes. If you have parallel connected devices in layout the same ambiguity exist also for device currents. If you have only a C extraction node crossprobing should be possible. It is currently not implemented and if you want to have that node w/o the extracted view there is a corrospond list. So you can use that in a Skill script. I think there is an feature/improvement request in the pipe, but that is some releases ago. For currents in the extracted most often the devices ar too small. So possible zoom in and click on the device pins.