new node with a new name but the same package

Hi,

I have created a node with a new name but the same package of a previous node (org.MySplitter_1.0.0.jar). If i simply overwrite this file in dropins, knime prints an error related to the previous version and the new node doesn't appear into the node repository. How can i delete all the information about the previous node?

(If i change the name of the package all work correctly...)

Thanks