ABAP Program for EDI 834

Hi

Has any one tried writing an ABAP program to generate an EDI Format file out of IDOC's or by reading directly from database..

I know its sounds like crazy idea but unfortunately we don't have any subsystems to convert idocs to EDI formats..

I have seen SAP provided some standard programs for some EDI's is there any such program for 834..I wanted to be absolute sure before i start working on this complex abap program

Thanks