Query regarding document type

Question

This is a basic part of FI
The Document flow in SAP-FI is categorized by the document types attached to them. All this document types differentiates the document flow, i.e. from where the accounting document was generated form SD, MM, FI etc. What SAP does is that for each Document types or rather groups of document types the data goes into four tables 1) Header table BKPF, contains the document type attached to the Document number
2) The Document table ( the table name starts generally with BS*) that is actually contains document number and its transactional details (debit amount and credit amount) for e.g. BSID and BSAD which contains the Sales order open and clear items
4) The Cluster table BSEG which contains the transactional amount of all the tables taken together, so it means that where ever the amount has come from it will go into the BSEG table and the transparent attached to it.
So what the program will do is:
1)     You will have a selection screen that will have a parameter entry for the Document type.
2)     Select all the table names from DD02L table where TABNAME = BS* and TABCLASS = TRANSP
3)     Think of the logic of how to connect the Document types to the BS* transparent table……….

Answer 1

using document types u can fetch the revelant document numbers from the header table BKPF.using the fetched document numbers u can fetch the necessary data from the line item tables (BS*).