Dear [Vendor/Supplier's Name], I hope this letter finds you well. I am writing to discuss the return of a purchase order and request an advance payment for an upcoming project. We have been working together for quite some time, and I have always appreciated your professionalism and quality of products/services. Firstly, I would like to address the issue regarding the purchase order. Unfortunately, due to unforeseen circumstances, we are no longer able to proceed with the order as initially planned. We understand that this may cause some inconvenience and apologize for any inconvenience caused. In regard to the payment, we kindly request an advance payment to cover certain costs associated with the project. Given the nature of our working relationship, I am confident that we can find a mutually beneficial agreement. We value your commitment to our business and believe that this advance payment will help us maintain a strong business alliance. Please find attached all relevant documentation related to the purchase order, including copies of invoices, order forms, and any additional information you may require. We kindly ask you to review the documents and process the return accordingly. Furthermore, we included our proposal for the advance payment, outlining the specific amount and payment terms we are requesting. If you have any questions or require further clarification on any aspect of this matter, please do not hesitate to reach out to us. We believe in maintaining open lines of communication and addressing any concerns promptly and effectively. Thank you for your understanding and cooperation in this matter. We value our business partnership with you and look forward to resolving this issue swiftly and amicably. Best regards, [Your Name] [Your Position/Designation] [Your Company Name] [Contact Information]