issue in creating sales order with ref contract(quantity)

hi friends,

I am creating sales order with reference contract using

"BAPI_SALESORDER_CREATEFROMDAT1"

my issue is with quantity field when i am entering quantity as 1 then it is taking as 0.001

i am also declaring its unit field too but there is no change.

in my program i am taking quantity as parameter.

field description is like this Order qty in sales units - 00009001 corresponds to 9.001

is there any chance of changing the quantity .

please help.