Purchase Order(PO) bapi_po_change not updating condition value - kwert field

Hi Everyone,

I am a ABEP er.

I used BAPI_PO_CHANGE to update the condition value(KBETR-Amount col in pricing)  in purchase order is working fine, But Now I need to update the KWERT(Condition Value col in pricing) field in the purchase order but I didn't seen any field (only cond_value field is available and the value passing to condition_value only updates the amount column not kwert field)  in bapi condition structure to pass kwert field, I tired more by different combinations but the KBETR field is updating not KWERT field.

My Condition Type is '%' and Amount/Fixed value. so It's allowing me to enter the kwert-condition value column manually from me22/me22n but not through bapi, Please advice me. Thank in Advance.