I had created a module for providing user authorisation for my parent module.I had created 'csv' file for  doing that.My aim is to make the customer menu 'read,write,create' access but not 'delete' for a user.For that me created a code shown below.

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink

access_res_partner_admin_staff,"res.partner admin staff",base.model_res_partner,group_admin_staff,1,1,1,0

But unfortunately every read,write,create and delete options were working.(while looking access rights for the specified user,there the access rights were correct as me given).Can anyone help me to fix the problem...!!