Why is it necessary to have a written "Order Acknowledgement" of Purchase Order from a supplier or contractor?

Thanks 

Purchase order should be written and documented ( Hard and Soft ) for :

• Reference when needed.
• To be an argument in the litigation and the courts.
• To protect yourself as an administrative or responsible for procurement.
• To be an historical reference if you want to buy from a new supplier.

Regards

Written " P O Acknowledgment " is treated as a formal document which is part of highly legal contract agreement which is enforceable & supportable in case of arbitration , mediation or litigation. 

I agree with omar. It is beneficial not only for administrative records but also to protect yourself against disputes.

To avoid any misunderstanding and delivery issues, it is always recommended to receive written order confirmation. 

Thanks for the invitation. I agree with the given answers.

For contractual agreement. To provide a product within agreed cost, quantity and specifications.

The basic objective of a written acknowledgment of a purchase order from supplier is to prove existence of a legally binding contract between the two parties.However, legally speaking , written acknowledgement of a purchase order is not necessary as long as one can otherwise prove the existence of a contract. This may be through actions of the supplier/contractor, any evidence verbal or circumstantial etc etc. However, a clear cut and unambiguous Purchase Order Acknowledgement is the best tool to prove existence of contract.

To avoid any misunderstanding and delivery issues,for refrence, for legal content,

The written acknowledgement acts a legally binding document, and helps to avoid any misunderstandings. 

Thank you for your invitation,

Of course it is necessary to have a written "Order Acknowledgement" of Purchase Order from a supplier or contractor in order to be legally binding contract and to create a formal Contract between both parties and to 

Written Order becomes a legal binding document with subject to certain terms and conditions mutually agreed upon.