Delete Release Strategies with Classification

Hi

i have deleted the release strategies using the following steps

1. Delete the release strategies

2. Delete the release indicators

3. Delete the release codes

4. Delete the release group

And i've used the SE16 to check if the entries in the tables T16FK, T16FV, T16FS, T16FC and T16FG have been deleated and the tables are all ok.

But when i execute the CL30N i still display the Release Stategies, how can i do to delete them?

Thanks in advance

Cristina