Cannot read the destination from the BI to the Solution Manager

Hi all

I am having 2 systems - SAP Solution Manager 7.1 and SAP NetWeaver 7.3 and the corresponding RFC connections betweeen them.
I am trying to configure the BW based reporting over the test management of the SolMan system using the solman_workcenter t-code.Idea is that the external BW system should be used for reporting.

The RFC connection from Solution Manager to BW seems to be fine. But the field, where the RFC Connection from BW to Solution Manager should be entered, remained empty and is now shown as inactive.
That's why an error: "Cannot read the destination from the BI to the Solution Manager" occurs. 

Question: Has anyone an idea if there is another way to add/edit the RFC Connection between BW and Solution Manager? (note: The rfc connection exists itself in the sm59!)

Thanks and regards!