Item category change in contract load of CRM

Hi Guys,

i am loading contracts into CRM-intellectual property Management. i have to create 2 to 3 line items for same product in one contract with higher level items. generally item category is determined and can be changed via GUI. my requirement is i want to change item category through FM CRM_ORDER_MAINTAIN by the time it creates contract but item category is not changing, showing what ever was determined.

i am passing item_type in ORDERADM_I and passing item_type field name for input fields but it is not helping me. Please let me know if any body has any clue..

Thanks for your help

Siva