BEAst: Orderlines should be included in the order response only when the OrderResponseCode is "CA" (Conditionally Accepted). For all other codes only the document header should be sent. When the order is Conditionally Accepted, all orderlines shall be included, not only those that are changed. Peppol:

Namespace
cac urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2
Child elements
Card Name Description
1..1 cac:LineItem

Description of line item

0..1 cac:SellerSubstitutedLineItem

Substituted line item by the seller

1..1 cac:OrderLineReference

Reference to order line

Rules
Identifier/Error message Flag
PEPPOL-T76-B03601
Element 'cac:LineItem' MUST be provided.
fatal
PEPPOL-T76-B03602
Element 'cac:OrderLineReference' MUST be provided.
fatal
PEPPOL-T76-B03603
Document MUST NOT contain elements not part of the data model.
fatal