资料：To：Sherry Linton From：Melanie Jury Date：15 July Subject：Purchase orders Please note that a purchase order （copy attached） must be completed for all purchases over 50 US D. Complete purchase orders should be passed to Christine Hantke to agree terms of payment with the supplier, and then sent to the Manchester office for final approval. Purchase orders under 50 USD can be paid for from the petty cash account. Many thanks for your co-operation. MJ What type of document is this?

资料：To：Sherry Linton
From：Melanie Jury
Date：15 July
Subject：Purchase orders
Please note that a purchase order （copy attached） must be completed for all purchases over 50 US
D.
Complete purchase orders should be passed to Christine Hantke to agree terms of payment with the supplier, and then sent to the Manchester office for final approval.
Purchase orders under 50 USD can be paid for from the petty cash account.
Many thanks for your co-operation.
MJ
What type of document is this?