Why quotations are considered as price perfection process? When work order is dispatched? When Tender is proclaimed?

Because who people is getting business, tender for that person.

and imported is that who company is give the think that quality was very good and price

To receive correct quotes, RFQs often include the specifications of the items/services to make sure all the suppliers are bidding on the same item/service. Logically, the more detailed the specifications, the more accurate the quote will be and comparable to the other suppliers. Another reason for being detailed in sending out an RFQ is that the specifications could be used as legal binding documentation for the suppliers.