You will have to modify sale_order function for create to call the workflow:

wf_service.trg_validate(uid, 'sale.order', ids[0], 'order_confirm', cr)

That way creating a new quotation will automatically go through workflow and create a sale order.

Hi Mariusz Mizgier
I know your code, It same in function "action button confirm" and it set confirm for the quotation. But "sale_order" is a class, I cant found a function with name "sale_order" or I dont know which function create a quotation to add your code here.

And I will create a module to inherit "sale" module, so, How do I modify that function to create sale order directly

Please explain more for me, please!!!

Thank you so much!