1. SAP Business Network for Supply Chain Documentation: In the guide for buyers
under the section for order collaboration
the rules for service orders are specified. It states
"For service items
suppliers can only confirm or reject the entire line item. They cannot propose changes to quantity or price in the order confirmation." This supports the rejection of partial confirmations (D) and establishes the binary accept/reject nature at the line-item level
making full confirmation (A) and full rejection (C) the primary PO-level outcomes.
Source: SAP Help Portal
"SAP Business Network for Supply Chain Collaboration and Fulfillment for Buyers"
Section: "Purchase order confirmation rules".
2. SAP Ariba Cloud Integration Gateway Documentation: The transaction support documentation for CIG confirms that the OrderConfirmationRequest cXML is used. The underlying Ariba Network business rules apply to these transactions. The cXML specification for OrderConfirmationItem does not support a "partially accepted" status for service lines; the valid statuses are accepted or rejected.
Source: SAP Help Portal
"Transactions supported through SAP Ariba Cloud Integration Gateway". (Note: This document points to the general Ariba Network rules for transaction-specific logic).