Symptoms

After a system copy, nodes of a source system still appeared on a target system. 

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If, however, the nodes have to be deleted, these steps should be done:

1. In tcode /DVD/APPD_STATUS, stop all HTTP SDK instances and wait for a while
2. Open tcode SE16 for the table /DVD/APPD_NODE, delete all old nodes
3. Open tcode SE16 for the table /DVD/APPD_PROXY, delete all old nodes
4. In tcode /DVD/APPD_STATUS, start all HTTP SDK instances and wait for a while. 

If the system copy is done again, the same steps should be repeated.