"Doc. Delivery Document Types" are used in Microsoft Dynamics 365 Business Central to give the User flexibility to adapt the setup per Document, whether that be the body of the email that gets sent out for it, what attachments are required for each or who receives them. Each Document Type has a unique Code and Description. The Primary Table No. Filter field tells the system which record(s) this document type should be used with. For example, a Sales Order Confirmation document type should use table 36 (Sales Order Header), while a remittance advice document type to be printed from the Payment Journal page should use table 81 (Gen. Journal Line). This never requires any change. 

For more information on how these are used, please read the following menu headings.