need to populate who columns in sql * loader

 HI,

i am trying to load the flat file data into staging table but in the mean time i need to capture who clumns and request if in that table

and my control file is

load data

infile'&1'

append into table xxmsninvstg

fields terminated by ','

optionally enclosed by '"'

trailing nullcols

(item_name

,item_desc

,uom_code

,template

,status

,organization_id

,organization_code

,error_msg

,error_flag constant 'N'

,process_flag constant 'N'

,last_updated_date sysdate

,created_by "fnd_global.user_id"

,creation_date   sysdate

,last_updated_by "fnd_global.user_id"

        ,request_id         " :fnd_global.conc_req"uest_id)