General ⇒ Hyperref: Defining the end of a part

[Nitrox]

I am using the package hyperref to get a bookmark tree in a pdf file. In my mainmatter I use the command \part several times. Now I have the problem that my backmatter (index, list of tables, ... ) is situated in the bookmark tree under the last part, where it should be just isolated items. Is there a possible way to define the end of a part to hyperref?

Thank you in advance