How do I add optional fields (e.g. a person reference or a PO-number) to a document?
You are able to add optional fields to your document by clicking the drop-down menu under the document details. This adds a preferred field on the header level of your document. If you wish to add an optional field on the line level you should click on the plus icon on the left side of the invoice line and another drop-down appears under the invoice line.
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