A 5-year contract requires the customer to use the vendor's system to process all of its transactions; the ultimate number of transactions is unknown. The customer simultaneously receives and consumes the benefits as the vendor performs. The vendor's promise is to provide CONTINUOUS access to the system rather than to process a specific quantity. Under Ind AS 115, this is:

Para 22(b) — the series provision — treats a series of distinct goods/services that are substantially the same and have the same pattern of transfer as a SINGLE PO. Each day of access is substantially the same (customer derives consistent benefit even if transactions per day vary), and each day meets the over-time PO criteria (simultaneous consumption). Single PO over five years.