How do I use Current Port in CST?

Hello,

I am using the CST EM Studio for coil design, where instead of waveguide ports and discrete ports, these sources can be picked:

How to use the Path Sources is clear.

But how is the Current Port used? When I pick two conducting faces for the current to flow in/out, there is an error: "Divergence check failed".

Thanks for your help!

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