DME engine for NACHA format

Hi all

Is it possible to generate a flat file & send it to the bank to do ACH payments as the bank ahs given me a NACHA format to adhere to if we are doing that?

I was thinking that we have to do an EDI Idoc transfer to the bank to do the ACH payments....

But now assuming I will send a flat file, is there a standard SAP tree structure in the DME engine for domestic USA payments or should I do a new structure & format tree...

Any documentation on the DME engine would be appreciated as I only have a print out of the pdf file but I lost the soft copy.....

Somebody who has done ACH payments through flat file in NACHA format please help with your inputs...

I thank you all for your time & effort...

Thanks

Morgan