Service procurement involves specific process flows that ensure the proper acquisition and management of services. Below is an explanation of the correct answers:

Manage invoices (A):Invoicing is a critical step in service procurement, where the supplier submits an invoice for the services rendered. This process ensures accurate payment based on agreed terms.

Manage purchase orders (B):Purchase orders are used to formally request services from a supplier. They define the scope, terms, and conditions of the service procurement.

Manage service entry sheets (C):Service entry sheets are used to confirm the completion of services by the supplier. They serve as a basis for invoice verification and payment.

Manage service contracts (D):While service contracts are important for long-term agreements, they are not part of the standard service procurement process flows.

Maintain quota arrangements (E):Quota arrangements are used for material procurement to allocate sources of supply and are not relevant to service procurement.