BAPI/FM to change schedule lines in sales contract(VA42)
My requirement is to change quantities by adding reduced rejection quantity & reason for rejection in schedule lines of a sales contract using BAPI/FM. I have searched BAPI's
BAPI_CUSTOMERCONTRACT_CHANGE and BAPI_SALESDOCUMENT_CHANGE but couldn't find fields to update item number, quanities(cumulative order quantity, reduced rejection quantity) etc..
Please suggest the BAPI suitable for my requirement.