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1. Purchase Order Reference: Include when the invoice relates to a specific purchase order or contract

2. Special Instructions: Any specific payment processing instructions or requirements, used when standard procedures don't apply

3. Tax Details: Detailed breakdown of tax calculations, required for complex tax situations or when requested by payer

4. Currency Exchange Information: Include when transaction involves foreign currency conversion

5. Recurring Payment Terms: Include for recurring payment arrangements, specifying frequency and duration

1. Schedule A - Detailed Service/Product Breakdown: Itemized list of products or services with detailed descriptions when main invoice requires more detail

2. Schedule B - Payment Schedule: For installment or recurring payments, detailing payment dates and amounts

3. Appendix 1 - Supporting Documentation: Any required supporting documents such as delivery confirmations or service completion reports

4. Appendix 2 - Tax Compliance Documentation: Required tax forms or certificates, particularly for cross-border transactions