In Microsoft Dynamics NAV, Documents have a limited life cycle and once obsolete, they need to be removed from the table. The Document History pattern helps us to create this. Examples of historical documents are Sales Order Archive, Sales Shipments, Invoices and Credit Memos. Issues Reminders, and Service Invoices. They act as data containers, and are often used to print documents. Once the documents are printed, they can be deleted.
An explanation of how to read and understand posting routines in Microsoft Dynamics NAV is available at https://www.youtube.com/watch?v=Wetd1Fa0rmw&list=PLhZ3P-LY7CqmVszuvtJLujFyHpsVN0U_w&index=4.