Current doesn't work in equations

[lort-Z]

Windows QUCS-S 24.1
I can get I parameter from current probe, but cant use it in equations.
Voltage works fine.

Simulation console message:
Ngspice started...
Warning from checkvalid: vector pr1 is not available or has zero length.
Error: RHS "pr1" invalid
Warning from checkvalid: vector y is not available or has zero length.

Note: No compatibility mode selected!

Circuit: * qucs 24.1.0 c:/users/lort_z/.qucs/test_prj/test.sch

Doing analysis at TEMP = 27.000000 and TNOM = 27.000000

No. of Data Rows : 200
Reset re-loads circuit * qucs 24.1.0 c:/users/lort_z/.qucs/test_prj/test.sch

Circuit: * qucs 24.1.0 c:/users/lort_z/.qucs/test_prj/test.sch

ngspice-40 done
Simulation finished

[ra3xdh]

Everything works as expected. The current probe is represented as the voltage source internally. Use the following syntax.