What type of PR allows for multiple invoices against a total value?

The type of Purchase Requisition (PR) that allows for multiple invoices against a total value is a service buy. This is because service buys are commonly structured to allow for a series of payments as services are rendered over time. They often involve contracts that stipulate milestones or deliverables, enabling the vendor to submit multiple invoices throughout the duration of the contract.

In contrast, a material buy typically involves a one-time payment or invoice, corresponding to a single purchase order. Contract award PRs might be associated with longer-term commitments but do not inherently guarantee multiple invoicing. Outbound MIPR PRs are specific to Military Interdepartmental Purchase Requests and are more focused on transferring funds between DoD entities rather than invoicing related to service delivery.

Thus, the service buy stands out as the correct type of PR in this context, as it aligns with the necessary structure for allowing multiple invoices against a total value, making it suitable for arrangements where services are provided incrementally or over a span of time.