I have been using BAPI_SALESORDER_CREATEFROMDAT2 to create sales orders. Plus, this BAPI can be used for a number of updates in sales orders. However, so far I haven't been able to use this BAPI to change partners in my SO. Please note that the only partner related structure is ORDER_PARTNERS , there is no _INX structure for the partners.
My question is: is there any chance of using this BAPI to change partners of a SO? Please do not reply with BAPI_SALESORDER_CHANGE , I already know that this BAPI does the job, I simply would like to use the first one for everything.