Document Layout is used for adding fields to the documents which, in their turn, could be shown in the Lasernet reports. These could be fields from the tables of documents (e.g.: Sales Shipment Header for the shipment document), or fields from another table (e.g.: Customer table) if the table has a relation to the document table (e.g.: the Sell-to Customer No. field in the Sales Shipment Header table has a relation to the No. field in the Customer table).