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1. Additional Expenses: Itemized list of any additional reimbursable expenses beyond the per diem rate, used when extra expenses are agreed upon

2. Project Reference: Specific project or contract reference numbers, used when the per diem relates to a specific project

3. Purchase Order Reference: Client's purchase order number if required by their procurement process

4. Exchange Rate Declaration: Required when invoice amounts are converted from foreign currency to Qatari Riyal

5. Special Instructions: Any specific billing or payment instructions agreed with the client

1. Timesheet: Detailed breakdown of days worked and activities performed

2. Expense Receipts: Copies of receipts for any additional claimed expenses

3. Service Agreement Reference: Copy or reference to the underlying agreement specifying per diem terms

4. Authorization Documents: Any pre-approvals or authorizations for the charged period or expenses