There are a number of types of additional document references such as order or billing references. You may want to refer to a previous invoice in a credit note or reference an advanced payment (as described in Serbia: Advanced Payment Information).

Some countries require that you configure these references in a specific way. For example, see Italy: Document Reference.

Generally, you use the AdditionalDocumentReference element to specify the reference. There are other similar elements such as:

These are listed in the In this Section section of this topic.

Country-Specific configurations

In this section

Topic	Description
Additional Document References Overview	Overview topic for this section.
Additional Document Reference	You may want to model references like URLs to other documents.
Sales and Order References	You may want to add a reference to an additional document, such as a sales or order refence.
Preceding Document References	You can specify a reference to a billing related document.
Dispatch Advice References	You can reference a dispatch advice in your Document.
Receipt Advice References	You can reference a receipt advice in your Documents.
Tender or Lot References	You can model a reference to a lot or tender.
Contract References	You can add a reference to a purchasing contract in your Documents.
Project References	You can add a reference to a project to your Document.