Discuss this issue to the relevant parties (Sales, Logistic, Finance and Account) to finalize the process which it should be.
Implement reviewing process by independent parties, for example, Order Taking Section Head and Sales Administrator Section Head to be authorized person to review and approve all sales quotation issued prior to submitting to the customer to ensure the validity. Evidences by authorized person as signature are existed in all sales quotation issued.
Develop procedure/ work instruction to support this operation