Copy - Paste with PostgreSQLStorage doesn't work

[floseries]

Hello,

I've defined a new object class with storage into a relational database of some fields.
All works fine, except if I try to copy and paste an instance of this class.

I get the following error message:

      Paste could not find clipboard content.

In addition: Cut and Paste works fine.

Probably I need to add some methods for storing data from the external storage but I don't know what to do.
Has anyone an idea or a good advice ?

Regards, Fritz