Delete Sales Order Condition at item Level

Hi Experts,

I am using  BAPI_SALESORDER_CHANGE bapi for modifying the condition at item level.For this i am passing 'U' in  order_header_inx, which is working fine.

Now, i have requirement to delete the condition from item level, for this i am passing 'D' in  order_header_inx and also passing item number, COND_ST_NO, COND_TYPE and COND_COUNT  in conditions_in  and  conditions_inx.

But still it is not deleting condition from item level.Please suggest.

Please have a look on below image, here i am trying to delete condition ZZZZ from item '10'

Please suggest.

Thanks.

Rohit