A small Information regarding the standard concurrent programs for imoprting purchase orders

 Hi,

Need a small information regarding how to import different types of purchase orders

like standard,blanket,planned and contract purchase orders

can any one please provide me in details information for the above

1) interface tables for importing standard purchase order and standard concurrent program  and error tables

2) interface tables for importing blanket purchase order and standard concurrent program  and error tables

3) interface tables for importing planned purchase order and standard concurrent program  and error tables

4)interface tables for importing contract purchase order and standard concurrent program  and error tables

this information helps me a lot.

thanks in advance

Regards