IDOC-FILE - If IDOC is not triggered, need to genarate file with constants

Hi Friends,

I have a scenario like this.

IDOC to FILE scenario.

1. IDOC will get triggerd everyday and flat file will be genatated at specified location.

2. If IDOC is not genarated for the day, need to genarate falt file with some constants.

Can anyone help me on this.

Thanks in advance.