BI monitoring - error on adding process chain

Hi experts,

we want to start with BI-monitoring in our SolMan.

However, in step 6.2 I am hanging by adding the Process Chains from BW-System.

I got to button add process chain, however after clicking the read-button I get a red-error button at the header without any error message.

If I do the same for BW-Reporting it works.

Does anybody know, if there is a special requirement for process chains?