Problem with partner roles using IDoc DEBMAS

Hi,

currently I have a small problem using the IDoc DEBMAS. I want that the KUNNR is generated so I don't fill the field in the IDoc structure. The debitor also has partner roles where KUNNR is the same as the one in the KNA1 structure so I also set it as 'initial'.

Now when I upload the debitors I get the following error message 'Data is incomplete; check'. I can I handle the IDoc that way that the KUNNR is generated by the BAPI and that I don't get an error in the KNVP structure?

Regards,

Timo