problem with plant field in item level?

hi experts,

i am creating contracts.

for that i am doing following things.

i. created bdc report and put data into application server(ALL11)

ii.    i am using EKKO,EKPO tables

  in header(EKKO) all the fields in flat file are getting updated,

BUT item level ekpo-werks(plant) is not getting updated.

i want to check mapping  for that what way i need to check.

and how to check plant is available or not?

reply me ASAP....................................THANKS