[Koha] Deleting journal issues

Hi everyone, I am new with Koha and I have been trying to delete journal issues/items. (I can not find this option in Koha manual) I used Edit serials - and chosen status delete. The journal issue was deleted but the next issue is immediately generated. How can I delete issue without generation of a next issue? I ended up with some issues which are way ahead and I can not delete them. They even have, as a status, expected option as the only option. Koha version is 3.02 U would appreciate any help. Sincerely, Ivana