A Package can be deleted if there are no services that are linked to the Package, which includes cancelled services. This is the case because services have a direct relationship with Packages and a service floating around without a Package could cause issues. The typical recommended action is to mark old Packages as "Inactive" instead of deleting them. But, if you are doing some testing you can delete the services in the services table in the database manually, and then you should be able to delete the Package in the UI. Always use the UI where possible. So, service deleted in database, then delete Package in Blesta.
We may change this in the future, but the restriction is there to be safe and we need to spend more time determining whether it's safe to delete a Package that has linked services.
Jackson M reacted to Paul in Deleting a service