Replacing Categories - Can't delete the old ones?

Replacing Categories - Can't delete the old ones?

Hello there!

As i said in the topic, we are going to replace all our categories, and would like to remove the old ones. We get this error:  http://prntscr.com/dmmqm3

"Category is in use by another module. As such we can not remove it from the database. However it has been marked so it can not be used"

However, i can still use it, and i can not delete it. What do i need to do, to be able to delete it?

With Kind Regards 

Lars Sverre Levang
IT - Klepp Municipality

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