RFBIBL00 usage

I am hoping someone can help me out with the usage of RFBIBL00 with some sample code and tips. I am trying to submit the program with a flexible dsn generated from file_get_name with no success. Also a format for the subsequent submission of RSBDCSUB would be useful. Before I get suggestions for alternative methods, the need to park the document led to use of RFBIBL00 rather than Bapi's or Idocs.

Thanks,

Ken Ito