Deleting items form journal lines to remove unwanted Item cards.

Hi all!
I am using Dynamics NAV Classic for my retail store, the problem here is a big number of item cards that were created in the initial stage of this project but with the passage of time i caught some mistakes in the items created, now i have created new item cards that are working fine, i want to remove those faulty item cards and when i try to delete them the system shows a message that "item cannot be deleted as it is already in journal lines", kindly tell me any possibility to solve this issue!
Shall be thankful.