Error in SDK

HI,

i HAVE DEVELOPED PURCHASE REQUISITION .

NOW I HAVE GIVEN CHOOSE FROM LIST IN PO FORM WHERE WE CAN LINK PURCHASE REQUISITION FORM (THROUGH DOCNUM).

using choose from list i can populate itemcode, itemname, qty details in PO form.

but when i am tying to submit po add button , i faced error like

"warehouse for row 1 is not assigned"

if i mapped warehouse & all other details then error message-

invalid total purchase order -document total"

but if i deleted itemcode & choose same item code in sap environment then it's working fine.

but if we r using combo box for linking PO & purchase order then its working fine.

so any one faced this problem...any idea about it......

Regards,

Avijit