the following scenario ,
1. Salesman only view his/her order
2. Salesman do not allow to see the cost price and also the suppliers from the product page
which is in the List/Tree view and also in the Form view in product selection dialog and product
the effected view that to be modified are as follow :
product.normal.form , product.normal.variant.formand we have to add in the groups="base.group_extended" to the field name="standard_price"
if you client like mine , are using the multi- variant , then i also require to go to customize the
menu items' groups , add in the "Useability / Extended View"
we hope this little information can help you to tweak the openERP to be more useful to your users as well.