Remove CX4-120 from NS500G

Hi,

we have a NS500G system running on a CX300 for testing in a demo lab.

I connected the datamover directly to the SP  ports of the CX300 system and everything works fine.

The only problem I have is, that I don´t know how to deregister the CX4-120 system from the NS500G.

When we run the NS500g it was connected to the CX4 and CX300 and now I see in the GUI the CX4 entrie, but it doens´t longer be connected to the celerra.

Does anyone know how I can remove this entry?