Payment Voucher is a GST invoice issued by a registered person liable to pay tax under Reverse Charge for goods supplied by an unregistered. Examples Petty Cash. A, B, C, D, E, F, G, H, I, J, K, L, M, N. 1. 2. 3, Petty Cash Voucher. 4, Note: Petty cash requests must not exceed € For the sample selections, the auditor needs to obtain supporting documents such as Invoice, PO and Payment details. 6 Sound budget management and variance.