Session processing in Error mode

Hi Friends,

I am Using BAPI all the error records after processing BAPI I am keeping in Session, In the output I am displaying the error errors, in the output toolbar I have added one button Process Session, when I click this button the created session should process in error mode.How can I achieve this.

If i am using RSBDCSUB it is processing in Background Mode, but I need the session to be processed in Error mode.

Thanks,

Ravi.