Zoho CRM can't hidden Unit price whit sale man

Zoho CRM can't hidden Unit price whit sale man

Dear all,
I'm use zoho CRM pro editor for my company. We need use module Inventorry for 1 admin and 5 sales-man.

I create P.O with Unit Price is 842580 VND(E.g), then create Price Book with 989000 VND for Sales. I'm sure hidden Unit Price for Sale and them can't see.

But when sale create SalesOrders, in Product details -> add product, sales can see unit price is 842580 VND (attach file)
When choise products, unit price show in List price. If i pick Price book 989000 VND, them can see Unit Price and List price (attach file).

I think it is bug or problem, because sale can't see unit price (sure hidden for profile/role)