regarding standard,blanket,planned and contract

 hi,Can any body please provide some information on different types of purchase orders technically

like tables affecting for each type

for standard purchase order the type_lookup_code='standard' and tables are po_headers_all

                                                                                                                             po_lines_all

                                                                                                                             po_line_locations_all

                                                                                                                             po_distributions_all

in addition to the  above mentioned tables for types blanket,planned and contract what are the additional tables used the remaining purchase order types

and can please explain what is the importance of po_headers_archieve_all and po_lines_archieve_all

please provide tables information for each po type

Thanks in advance

Regards