Problem with NDMP Node Deletation

Hello,

I have a problem with the NDMP-node deletion.

Error ANR2152E REMOVE NODE : Inventory references still exist for node xxx.
ANS8001I Return Code 13.
There is no filespaces. I have deleted all schedulers, rules and datamovers for this node.

When I do "q node xxx f=d", there is no information.
When i do "select * from nodes where node_name ='xxx'" all information for this node is there.
So how can i solve this Problem?