What copy control parameters are available at the header level when setting up a billing document?

When setting up a billing document, the reference number is one of the key copy control parameters available at the header level. This parameter allows for the capturing of critical identifiers from the source document, such as a sales order or delivery document, which links the billing document back to its originating transaction. By including this reference number, the system can maintain traceability and provide a clear audit trail between documents within the sales and distribution process.

The other options, while they may be relevant in different contexts, do not represent header-level copy control parameters in the same manner. The sales order number, for example, is typically treated at the item level rather than the header level, where more general properties like the reference number are used to manage document relationships comprehensively. Similarly, the copy item number is also an aspect focused on line items, and the delivery date aligns with the expected item-specific data rather than functioning as a header parameter.