BAPI / LSMW

Hi Gurus,

I use LSMW for sales order creation and the feild which I have taken are only doc type, sales area, customer no and material no. Rest all data like plant,price etc etc gets determined from the master data maintained and is automatically populated in the order.

My question is that if we use BAPI than does the data gets determined in the sales order or what ever we enter in BAPI will only get populated in the order. Since LSMW is just like running transaction so data gets populated from the masters maintained also, but if we use BAPI so will the data get determined.\

Komal